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VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft is unpacked and unveiled in the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in California. The container protected the spacecraft on its journey from Campos, Brazil, aboard a U.S. Air Force C-17 transport plane. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch to low Earth orbit. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will map global changes in salinity at the ocean's surface. Salinity is a key measurement for understanding how changes in rainfall, evaporation and the melting of freezing of ice influence ocean circulation and are linked to variations in Earth's climate. The three-year mission will provide new insights into how variations in ocean surface salinity relate to these fundamental climate processes. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-2727

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft is ...

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft is unpacked and unveiled in the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in California. The con... More

VANDENBERG AIR FORCE BASE, Calif. -- Technicians begin to unpack and unveil the Aquarius/SAC-D spacecraft in the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in California. The container protected the spacecraft on its journey from Campos, Brazil, aboard a U.S. Air Force C-17 transport plane. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch to low Earth orbit. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will map global changes in salinity at the ocean's surface. Salinity is a key measurement for understanding how changes in rainfall, evaporation and the melting of freezing of ice influence ocean circulation and are linked to variations in Earth's climate. The three-year mission will provide new insights into how variations in ocean surface salinity relate to these fundamental climate processes. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-2725

VANDENBERG AIR FORCE BASE, Calif. -- Technicians begin to unpack and u...

VANDENBERG AIR FORCE BASE, Calif. -- Technicians begin to unpack and unveil the Aquarius/SAC-D spacecraft in the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in Calif... More

VANDENBERG AIR FORCE BASE, Calif. -- Technicians prepare to unpack and unveil the Aquarius/SAC-D spacecraft in the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in California. The container protected the spacecraft on its journey from Campos, Brazil, aboard a U.S. Air Force C-17 transport plane. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch to low Earth orbit. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will map global changes in salinity at the ocean's surface. Salinity is a key measurement for understanding how changes in rainfall, evaporation and the melting of freezing of ice influence ocean circulation and are linked to variations in Earth's climate. The three-year mission will provide new insights into how variations in ocean surface salinity relate to these fundamental climate processes. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-2724

VANDENBERG AIR FORCE BASE, Calif. -- Technicians prepare to unpack and...

VANDENBERG AIR FORCE BASE, Calif. -- Technicians prepare to unpack and unveil the Aquarius/SAC-D spacecraft in the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in Cal... More

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft is secured to the Rotation and Test Fixture in cell 3 at the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in California. There, the spacecraft will undergo inspection of its solar arrays and tests will be conducted on its propulsion subsystem. Further testing of the satellites various other systems will follow. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will map global changes in salinity at the ocean's surface. The three-year mission will provide new insights into how variations in ocean surface salinity relate to these fundamental climate processes. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-2762

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft is ...

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft is secured to the Rotation and Test Fixture in cell 3 at the Spaceport Systems International payload processing facility at Vandenberg Air Forc... More

VANDENBERG AIR FORCE BASE, Calif. -- An overhead crane moves the Aquarius/SAC-D spacecraft to cell 3 at the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in California. There, the spacecraft will undergo inspection of its solar arrays and tests will be conducted on its propulsion subsystem. Further testing of the satellites various other systems will follow. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will map global changes in salinity at the ocean's surface. The three-year mission will provide new insights into how variations in ocean surface salinity relate to these fundamental climate processes. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-2759

VANDENBERG AIR FORCE BASE, Calif. -- An overhead crane moves the Aquar...

VANDENBERG AIR FORCE BASE, Calif. -- An overhead crane moves the Aquarius/SAC-D spacecraft to cell 3 at the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in California... More

VANDENBERG AIR FORCE BASE, Calif. -- A technician guides the Aquarius/SAC-D spacecraft toward the Rotation and Test Fixture in cell 3 at the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in California. There, the spacecraft will undergo inspection of its solar arrays and tests will be conducted on its propulsion subsystem. Further testing of the satellites various other systems will follow. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will map global changes in salinity at the ocean's surface. The three-year mission will provide new insights into how variations in ocean surface salinity relate to these fundamental climate processes. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-2760

VANDENBERG AIR FORCE BASE, Calif. -- A technician guides the Aquarius/...

VANDENBERG AIR FORCE BASE, Calif. -- A technician guides the Aquarius/SAC-D spacecraft toward the Rotation and Test Fixture in cell 3 at the Spaceport Systems International payload processing facility at Vanden... More

VANDENBERG AIR FORCE BASE, Calif. -- Technicians await the arrival of the Aquarius/SAC-D spacecraft to cell 3 at the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in California. There, the spacecraft will undergo inspection of its solar arrays and tests will be conducted on its propulsion subsystem. Further testing of the satellites various other systems will follow. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will map global changes in salinity at the ocean's surface. The three-year mission will provide new insights into how variations in ocean surface salinity relate to these fundamental climate processes. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-2752

VANDENBERG AIR FORCE BASE, Calif. -- Technicians await the arrival of...

VANDENBERG AIR FORCE BASE, Calif. -- Technicians await the arrival of the Aquarius/SAC-D spacecraft to cell 3 at the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in ... More

VANDENBERG AIR FORCE BASE, Calif. -- A technician secures the Aquarius/SAC-D spacecraft to the Rotation and Test Fixture in cell 3 at the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in California. There, the spacecraft will undergo inspection of its solar arrays and tests will be conducted on its propulsion subsystem. Further testing of the satellites various other systems will follow. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will map global changes in salinity at the ocean's surface. The three-year mission will provide new insights into how variations in ocean surface salinity relate to these fundamental climate processes. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-2761

VANDENBERG AIR FORCE BASE, Calif. -- A technician secures the Aquarius...

VANDENBERG AIR FORCE BASE, Calif. -- A technician secures the Aquarius/SAC-D spacecraft to the Rotation and Test Fixture in cell 3 at the Spaceport Systems International payload processing facility at Vandenber... More

VANDENBERG AIR FORCE BASE, Calif. -- An overhead crane lifts the Aquarius/SAC-D spacecraft from its stand by an overhead to cell 3 at the Spaceport Systems International payload processing facility at Vandenberg Air Force Base in California. There, the spacecraft will undergo inspection of its solar arrays and tests will be conducted on its propulsion subsystem. Further testing of the satellites various other systems will follow. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will map global changes in salinity at the ocean's surface. The three-year mission will provide new insights into how variations in ocean surface salinity relate to these fundamental climate processes. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-2756

VANDENBERG AIR FORCE BASE, Calif. -- An overhead crane lifts the Aquar...

VANDENBERG AIR FORCE BASE, Calif. -- An overhead crane lifts the Aquarius/SAC-D spacecraft from its stand by an overhead to cell 3 at the Spaceport Systems International payload processing facility at Vandenber... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to rotate the Aquarius/SAC-D spacecraft into a vertical position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Dan Liberotti, VAFB KSC-2011-2911

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to rotate the Aquarius/SAC-D spacecraft into a v... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians are rotating the Aquarius/SAC-D spacecraft into a vertical position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Dan Liberotti, VAFB KSC-2011-2914

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians are rotating the Aquarius/SAC-D spacecraft into a vertic... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians are rotating the Aquarius/SAC-D spacecraft into a vertical position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Dan Liberotti, VAFB KSC-2011-2913

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians are rotating the Aquarius/SAC-D spacecraft into a verti... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians begin to rotate the Aquarius/SAC-D spacecraft into a vertical position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Dan Liberotti, VAFB KSC-2011-2912

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians begin to rotate the Aquarius/SAC-D spacecraft into a ver... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians have rotated the Aquarius/SAC-D spacecraft into a vertical position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Dan Liberotti, VAFB KSC-2011-2915

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians have rotated the Aquarius/SAC-D spacecraft into a vertic... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to rotate the Aquarius/SAC-D spacecraft from a vertical to horizontal position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-3000

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to rotate the Aquarius/SAC-D spacecraft from a v... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to rotate the Aquarius/SAC-D spacecraft from a vertical to horizontal position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-2999

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to rotate the Aquarius/SAC-D spacecraft from a ... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians have rotated the Aquarius/SAC-D spacecraft into a horizontal position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-3007

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians have rotated the Aquarius/SAC-D spacecraft into a hori... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians are rotating the Aquarius/SAC-D spacecraft from a vertical to horizontal position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-3002

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians are rotating the Aquarius/SAC-D spacecraft from a vertic... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians are rotating the Aquarius/SAC-D spacecraft from a vertical to horizontal position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-3004

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians are rotating the Aquarius/SAC-D spacecraft from a verti... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians are rotating the Aquarius/SAC-D spacecraft from a vertical to horizontal position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-3001

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians are rotating the Aquarius/SAC-D spacecraft from a verti... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to rotate the Aquarius/SAC-D spacecraft from a vertical to horizontal position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-2997

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to rotate the Aquarius/SAC-D spacecraft from a v... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians have rotated the Aquarius/SAC-D spacecraft into a horizontal position for testing. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/Randy Beaudoin, VAFB KSC-2011-3006

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians have rotated the Aquarius/SAC-D spacecraft into a horizo... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to close the solar arrays on the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3223

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to close the solar arrays on the Aquarius/SAC-D ... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to close the solar arrays on the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3222

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to close the solar arrays on the Aquarius/SAC-D ... More

VANDENBERG AIR FORCE BASE, Calif. --In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians attach an overhead crane to the second solar array that will be integrated to the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3238

VANDENBERG AIR FORCE BASE, Calif. --In Space Systems International's P...

VANDENBERG AIR FORCE BASE, Calif. --In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians attach an overhead crane to the second solar array that w... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians extend a solar array on the Aquarius/SAC-D spacecraft to test the release mechanism sequence for the array using signal commands. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3231

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians extend a solar array on the Aquarius/SAC-D spacecraft t... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians remove a protective cover from the solar array after integration to the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3225

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians remove a protective cover from the solar array after int... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians guide an overhead crane lowering the second solar array toward the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3241

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians guide an overhead crane lowering the second solar array ... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians perform blanket work in the vicinity of the dual-thruster modules on the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3233

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians perform blanket work in the vicinity of the dual-thruste... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, a technician measures the clearance between the solar panel and a dual-thruster module after the array was installed to the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3227

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, a technician measures the clearance between the solar panel and a du... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians have detached the overhead crane that moved the second solar array for integration and testing to the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3244

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians have detached the overhead crane that moved the second s... More

VANDENBERG AIR FORCE BASE, Calif. --In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians have suspended a platform over the Aquarius/SAC-D spacecraft to allow access for the installation of the second solar array. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3236

VANDENBERG AIR FORCE BASE, Calif. --In Space Systems International's P...

VANDENBERG AIR FORCE BASE, Calif. --In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians have suspended a platform over the Aquarius/SAC-D spacecr... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians have removed the second solar array that will be integrated to the Aquarius/SAC-D spacecraft from its protective container. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3239

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians have removed the second solar array that will be integra... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians perform blanket work in the vicinity of the dual-thruster modules on the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3234

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians perform blanket work in the vicinity of the dual-thruste... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians on suspended platforms are preparing to install the second solar array to the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3240

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians on suspended platforms are preparing to install the seco... More

VANDENBERG AIR FORCE BASE, Calif. --In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to test the second solar array after integration to the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3245

VANDENBERG AIR FORCE BASE, Calif. --In Space Systems International's P...

VANDENBERG AIR FORCE BASE, Calif. --In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to test the second solar array after integration ... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians configure antenna hats in preparation for system tests on the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3235

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians configure antenna hats in preparation for system tests o... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, a technician makes an adjustment to the solar array after it was installed to the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3228

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, a technician makes an adjustment to the solar array after it was ins... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to test the solar array after its integration to the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3226

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to test the solar array after its integration to... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to test the second solar array after integration to the Aquarius/SAC-D spacecraft. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3246

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians prepare to test the second solar array after integration... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians extend the second solar array on the Aquarius/SAC-D spacecraft to test the release mechanism sequence for the array using signal commands. Following final tests, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June launch. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3249

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, technicians extend the second solar array on the Aquarius/SAC-D spa... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, NASA's Aquarius/SAC-D spacecraft is rotated for the final time into a vertical position prior to its installation into a transportation canister. Following delivery to the launch pad, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June liftoff. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3490

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, NASA's Aquarius/SAC-D spacecraft is rotated for the final time into ... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, NASA's Aquarius/SAC-D spacecraft is rotated for the final time into a vertical position prior to its installation into a transportation canister. Following delivery to the launch pad, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June liftoff. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3491

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, NASA's Aquarius/SAC-D spacecraft is rotated for the final time into ... More

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, NASA's Aquarius/SAC-D spacecraft is rotated for the final time into a vertical position prior to its installation into a transportation canister. Following delivery to the launch pad, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June liftoff. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3488

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's ...

VANDENBERG AIR FORCE BASE, Calif. -- In Space Systems International's Payload Processing Facility at Vandenberg Air Force Base in California, NASA's Aquarius/SAC-D spacecraft is rotated for the final time into ... More

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft is secured inside its payload transportation canister for transfer to NASA's Space Launch Complex-2 (SLC-2) at Vandenberg Air Force Base in California. There, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3853

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft is ...

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft is secured inside its payload transportation canister for transfer to NASA's Space Launch Complex-2 (SLC-2) at Vandenberg Air Force Base in Cal... More

VANDENBERG AIR FORCE BASE, Calif. -- Workers remove the payload transportation canister from the Aquarius/SAC-D spacecraft, after it was lifted into the mobile service tower at NASA's Space Launch Complex-2 (SLC-2) at Vandenberg Air Force Base in California. There, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3862

VANDENBERG AIR FORCE BASE, Calif. -- Workers remove the payload transp...

VANDENBERG AIR FORCE BASE, Calif. -- Workers remove the payload transportation canister from the Aquarius/SAC-D spacecraft, after it was lifted into the mobile service tower at NASA's Space Launch Complex-2 (SL... More

VANDENBERG AIR FORCE BASE, Calif. -- At Vandenberg Air Force Base in California, NASA's Aquarius/SAC-D spacecraft, secured inside its payload transportation canister, is being transferred to Space Launch Complex-2. There, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June liftoff. Aquarius, the NASA-built primary instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3855

VANDENBERG AIR FORCE BASE, Calif. -- At Vandenberg Air Force Base in C...

VANDENBERG AIR FORCE BASE, Calif. -- At Vandenberg Air Force Base in California, NASA's Aquarius/SAC-D spacecraft, secured inside its payload transportation canister, is being transferred to Space Launch Comple... More

VANDENBERG AIR FORCE BASE, Calif. -- An overhead crane lifts the Aquarius/SAC-D spacecraft, secured inside its payload transportation canister, into the mobile service tower at NASA's Space Launch Complex-2 (SLC-2) at Vandenberg Air Force Base in California. There, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3861

VANDENBERG AIR FORCE BASE, Calif. -- An overhead crane lifts the Aquar...

VANDENBERG AIR FORCE BASE, Calif. -- An overhead crane lifts the Aquarius/SAC-D spacecraft, secured inside its payload transportation canister, into the mobile service tower at NASA's Space Launch Complex-2 (SL... More

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft is secured inside its payload transportation canister for transfer to NASA's Space Launch Complex-2 (SLC-2) at Vandenberg Air Force Base in California. There, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3852

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft is ...

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft is secured inside its payload transportation canister for transfer to NASA's Space Launch Complex-2 (SLC-2) at Vandenberg Air Force Base in Cal... More

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft, secured inside its payload transportation canister, has been delivered to NASA's Space Launch Complex-2 (SLC-2) at Vandenberg Air Force Base in California. There, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3858

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft, se...

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft, secured inside its payload transportation canister, has been delivered to NASA's Space Launch Complex-2 (SLC-2) at Vandenberg Air Force Base i... More

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft, secured inside its payload transportation canister, is being transferred to NASA's Space Launch Complex-2 (SLC-2) at Vandenberg Air Force Base in California. There, the spacecraft will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-3854

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft, se...

VANDENBERG AIR FORCE BASE, Calif. -- The Aquarius/SAC-D spacecraft, secured inside its payload transportation canister, is being transferred to NASA's Space Launch Complex-2 (SLC-2) at Vandenberg Air Force Base... More

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, workers prepare to install the Aquarius/SAC-D spacecraft into the United Launch Alliance’s Delta II payload fairing. Aquarius will be integrated to the Delta II rocket in preparation for the targeted June 9 liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-4280

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower a...

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, workers prepare to install the Aquarius/SAC-D spacecraft into the Unit... More

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, workers prepare the Aquarius/SAC-D spacecraft for fairing installation. Aquarius will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June 9 liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-4278

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower a...

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, workers prepare the Aquarius/SAC-D spacecraft for fairing installation... More

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, workers prepare the Aquarius/SAC-D spacecraft for fairing installation. Aquarius will be integrated to a United Launch Alliance Delta II rocket in preparation for the targeted June 9 liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-4277

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower a...

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, workers prepare the Aquarius/SAC-D spacecraft for fairing installation... More

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, a technician secures the United Launch Alliance’s Delta II payload fairing around the Aquarius/SAC-D spacecraft. Aquarius will be integrated to the Delta II rocket in preparation for the targeted June 9 liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-4283

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower a...

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, a technician secures the United Launch Alliance’s Delta II payload fai... More

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, workers monitor the progress as the United Launch Alliance’s Delta II payload fairing closes around the Aquarius/SAC-D spacecraft. Aquarius will be integrated to the Delta II rocket in preparation for the targeted June 9 liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-4281

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower a...

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, workers monitor the progress as the United Launch Alliance’s Delta II ... More

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, the Aquarius/SAC-D spacecraft is secure inside the United Launch Alliance’s Delta II payload fairing. Aquarius will be integrated to the Delta II rocket in preparation for the targeted June 9 liftoff. Aquarius, the NASA-built instrument on the SAC-D spacecraft, will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. Photo credit: NASA/VAFB KSC-2011-4285

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower a...

VANDENBERG AIR FORCE BASE, Calif. -- Inside the mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California, the Aquarius/SAC-D spacecraft is secure inside the United Launch Allia... More

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Vandenberg Air Force Base in California the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop is prepared for launch. Liftoff is slated for 7:20 PDT/10:20 EDT today. Aquarius, the NASA-built instrument on the SAC-D spacecraft will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. For more information visit: www.nasa.gov/aquarius. Photo credit: NASA/VAFB KSC-2011-4357

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Van...

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Vandenberg Air Force Base in California the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop is prepared for laun... More

VANDENBERG AIR FORCE BASE, Calif. -- The mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California slowly moves away from the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop in preparation for launch. Liftoff is slated for 7:20 PDT/10:20 EDT today. Aquarius, the NASA-built instrument on the SAC-D spacecraft will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. For more information visit: www.nasa.gov/aquarius. Photo credit: NASA/VAFB KSC-2011-4352

VANDENBERG AIR FORCE BASE, Calif. -- The mobile service tower at NASA'...

VANDENBERG AIR FORCE BASE, Calif. -- The mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California slowly moves away from the United Launch Alliance Delta II rocket with the Aqu... More

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Vandenberg Air Force Base in California the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop is prepared for launch. Liftoff is slated for 7:20 PDT/10:20 EDT today. Aquarius, the NASA-built instrument on the SAC-D spacecraft will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. For more information visit: www.nasa.gov/aquarius. Photo credit: NASA/VAFB KSC-2011-4363

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Van...

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Vandenberg Air Force Base in California the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop is prepared for laun... More

VANDENBERG AIR FORCE BASE, Calif. -- The mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California has moved away from the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop in preparation for launch. Liftoff is slated for 7:20 PDT/10:20 EDT today. Aquarius, the NASA-built instrument on the SAC-D spacecraft will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. For more information visit: www.nasa.gov/aquarius. Photo credit: NASA/VAFB KSC-2011-4356

VANDENBERG AIR FORCE BASE, Calif. -- The mobile service tower at NASA'...

VANDENBERG AIR FORCE BASE, Calif. -- The mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California has moved away from the United Launch Alliance Delta II rocket with the Aquari... More

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Vandenberg Air Force Base in California the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop is prepared for launch. Liftoff is slated for 7:20 PDT/10:20 EDT today. Aquarius, the NASA-built instrument on the SAC-D spacecraft will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. For more information visit: www.nasa.gov/aquarius. Photo credit: NASA/VAFB KSC-2011-4362

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Van...

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Vandenberg Air Force Base in California the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop is prepared for laun... More

VANDENBERG AIR FORCE BASE, Calif. -- The mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California has moved away from the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop in preparation for launch. Liftoff is slated for 7:20 PDT/10:20 EDT today. Aquarius, the NASA-built instrument on the SAC-D spacecraft will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. For more information visit: www.nasa.gov/aquarius. Photo credit: NASA/VAFB KSC-2011-4353

VANDENBERG AIR FORCE BASE, Calif. -- The mobile service tower at NASA'...

VANDENBERG AIR FORCE BASE, Calif. -- The mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California has moved away from the United Launch Alliance Delta II rocket with the Aquari... More

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Vandenberg Air Force Base in California the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop is prepared for launch. Liftoff is slated for 7:20 PDT/10:20 EDT today. Aquarius, the NASA-built instrument on the SAC-D spacecraft will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. For more information visit: www.nasa.gov/aquarius. Photo credit: NASA/VAFB KSC-2011-4359

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Van...

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Vandenberg Air Force Base in California the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop is prepared for laun... More

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Vandenberg Air Force Base in California the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop is prepared for launch. Liftoff is slated for 7:20 PDT/10:20 EDT today. Aquarius, the NASA-built instrument on the SAC-D spacecraft will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. For more information visit: www.nasa.gov/aquarius. Photo credit: NASA/VAFB KSC-2011-4364

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Van...

VANDENBERG AIR FORCE BASE, Calif. -- At NASA's Launch Complex-2 at Vandenberg Air Force Base in California the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop is prepared for laun... More

VANDENBERG AIR FORCE BASE, Calif. -- The mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California has moved away from the United Launch Alliance Delta II rocket with the Aquarius/SAC-D spacecraft atop in preparation for launch. Liftoff is slated for 7:20 PDT/10:20 EDT today. Aquarius, the NASA-built instrument on the SAC-D spacecraft will provide new insights into how variations in ocean surface salinity relate to fundamental climate processes on its three-year mission. For more information visit: www.nasa.gov/aquarius. Photo credit: NASA/VAFB KSC-2011-4354

VANDENBERG AIR FORCE BASE, Calif. -- The mobile service tower at NASA'...

VANDENBERG AIR FORCE BASE, Calif. -- The mobile service tower at NASA's Launch Complex-2 at Vandenberg Air Force Base in California has moved away from the United Launch Alliance Delta II rocket with the Aquari... More

CAPE CANAVERAL, Fla. – Joel Tumbiolo, launch weather officer, 45th Weather Squadron, Cape Canaveral Air Force Station, Fla., participates in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6750

CAPE CANAVERAL, Fla. – Joel Tumbiolo, launch weather officer, 45th Wea...

CAPE CANAVERAL, Fla. – Joel Tumbiolo, launch weather officer, 45th Weather Squadron, Cape Canaveral Air Force Station, Fla., participates in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news c... More

CAPE CANAVERAL, Fla. – Ed Weiler, NASA associate administrator, Science Mission Directorate, participates in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6749

CAPE CANAVERAL, Fla. – Ed Weiler, NASA associate administrator, Scienc...

CAPE CANAVERAL, Fla. – Ed Weiler, NASA associate administrator, Science Mission Directorate, participates in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference in the NASA Press Site... More

CAPE CANAVERAL, Fla. – John Henk, GRAIL program manager, Lockheed Martin Space Systems, Denver, Colo., participates in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6751

CAPE CANAVERAL, Fla. – John Henk, GRAIL program manager, Lockheed Mart...

CAPE CANAVERAL, Fla. – John Henk, GRAIL program manager, Lockheed Martin Space Systems, Denver, Colo., participates in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference in the NASA ... More

CAPE CANAVERAL, Fla. – A Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference is held in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. From left are George Diller, NASA Public Affairs; Ed Weiler, NASA associate administrator, Science Mission Directorate; Tim Dunn, NASA launch director for the agency’s Launch Services Program; Vernon Thorp, program manager, NASA Missions, United Launch Alliance; David Lehman, GRAIL project manager, NASA’s Jet Propulsion Laboratory; John Henk, GRAIL program manager, Lockheed Martin Space Systems, Denver, Colo.; and Joel Tumbiolo, launch weather officer, 45th Weather Squadron, Cape Canaveral Air Force Station, Fla. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6752

CAPE CANAVERAL, Fla. – A Gravity Recovery and Interior Laboratory (GRA...

CAPE CANAVERAL, Fla. – A Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference is held in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. From left are George Dill... More

CAPE CANAVERAL, Fla. – News media participate in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference held in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. On the dais, panelist from left are Ed Weiler, NASA associate administrator, Science Mission Directorate; Tim Dunn, NASA launch director for the agency’s Launch Services Program; Vernon Thorp, program manager, NASA Missions, United Launch Alliance; David Lehman, GRAIL project manager, NASA’s Jet Propulsion Laboratory; John Henk, GRAIL program manager, Lockheed Martin Space Systems, Denver, Colo.; and Joel Tumbiolo, launch weather officer, 45th Weather Squadron, Cape Canaveral Air Force Station, Fla. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6753

CAPE CANAVERAL, Fla. – News media participate in the Gravity Recovery ...

CAPE CANAVERAL, Fla. – News media participate in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference held in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. ... More

CAPE CANAVERAL, Fla. – David Lehman, GRAIL project manager, NASA’s Jet Propulsion Laboratory, participates in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6748

CAPE CANAVERAL, Fla. – David Lehman, GRAIL project manager, NASA’s Jet...

CAPE CANAVERAL, Fla. – David Lehman, GRAIL project manager, NASA’s Jet Propulsion Laboratory, participates in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference in the NASA Press Sit... More

CAPE CANAVERAL, Fla. – Vernon Thorp, program manager, NASA Missions, United Launch Alliance, participates in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6747

CAPE CANAVERAL, Fla. – Vernon Thorp, program manager, NASA Missions, U...

CAPE CANAVERAL, Fla. – Vernon Thorp, program manager, NASA Missions, United Launch Alliance, participates in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference in the NASA Press Site... More

CAPE CANAVERAL, Fla. – Tim Dunn, NASA launch director for the agency’s Launch Services Program, participates in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6746

CAPE CANAVERAL, Fla. – Tim Dunn, NASA launch director for the agency’s...

CAPE CANAVERAL, Fla. – Tim Dunn, NASA launch director for the agency’s Launch Services Program, participates in the Gravity Recovery and Interior Laboratory (GRAIL) prelaunch news conference in the NASA Press S... More

CAPE CANAVERAL, Fla. – Tweetup participants ask questions during prelaunch activities for NASA’s Gravity Recovery and Interior Laboratory (GRAIL) mission at the Kennedy Space Center Visitor Complex in Florida. Participants toured NASA’s Kennedy Space Center and got a close-up view of Space Launch Complex 17B at Cape Canaveral Air Force Station. The tweeters will share their experiences with followers through the social networking site Twitter. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon’s gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon’s crust and mantle and will help answer fundamental questions about the moon’s internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon’s gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Gianni Woods KSC-2011-6799

CAPE CANAVERAL, Fla. – Tweetup participants ask questions during prela...

CAPE CANAVERAL, Fla. – Tweetup participants ask questions during prelaunch activities for NASA’s Gravity Recovery and Interior Laboratory (GRAIL) mission at the Kennedy Space Center Visitor Complex in Florida. ... More

CAPE CANAVERAL, Fla. – NASA Administrator Charlie Bolden shares a humorous moment with a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during prelaunch activities for the agency’s Gravity Recovery and Interior Laboratory (GRAIL) mission. Participants toured NASA’s Kennedy Space Center and got a close-up view of Space Launch Complex 17B at Cape Canaveral Air Force Station. The tweeters will share their experiences with followers through the social networking site Twitter. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon’s gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon’s crust and mantle and will help answer fundamental questions about the moon’s internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon’s gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Gianni Woods KSC-2011-6789

CAPE CANAVERAL, Fla. – NASA Administrator Charlie Bolden shares a humo...

CAPE CANAVERAL, Fla. – NASA Administrator Charlie Bolden shares a humorous moment with a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during prelaunch activities for the ... More

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral Air Force Station, spotlights illuminate the United Launch Alliance Delta II rocket that will launch NASA's Gravity Recovery and Interior Laboratory mission. Preparations are under way to roll the mobile service tower away from the rocket. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6776

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral ...

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral Air Force Station, spotlights illuminate the United Launch Alliance Delta II rocket that will launch NASA's Gravity Recovery and Interior La... More

CAPE CANAVERAL, Fla. – – Maria Zuber, GRAIL principal investigator with the Massachusetts Institute of Technology, participates in the Gravity Recovery and Interior Laboratory (GRAIL) mission science briefing in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6765

CAPE CANAVERAL, Fla. – – Maria Zuber, GRAIL principal investigator wit...

CAPE CANAVERAL, Fla. – – Maria Zuber, GRAIL principal investigator with the Massachusetts Institute of Technology, participates in the Gravity Recovery and Interior Laboratory (GRAIL) mission science briefing i... More

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral Air Force Station, the mobile service tower slowly rolls away from the United Launch Alliance Delta II rocket that will launch NASA's Gravity Recovery and Interior Laboratory mission. The "rollback" began at about 11:20 p.m. EDT. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6781

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral ...

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral Air Force Station, the mobile service tower slowly rolls away from the United Launch Alliance Delta II rocket that will launch NASA's Gravit... More

CAPE CANAVERAL, Fla. – Maria Zuber, GRAIL principal investigator at the Massachusetts Institute of Technology in Cambridge, speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during prelaunch activities for NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission. Participants toured NASA’s Kennedy Space Center and got a close-up view of Space Launch Complex 17B at Cape Canaveral Air Force Station. The tweeters will share their experiences with followers through the social networking site Twitter. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon’s gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon’s crust and mantle and will help answer fundamental questions about the moon’s internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon’s gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Gianni Woods KSC-2011-6794

CAPE CANAVERAL, Fla. – Maria Zuber, GRAIL principal investigator at th...

CAPE CANAVERAL, Fla. – Maria Zuber, GRAIL principal investigator at the Massachusetts Institute of Technology in Cambridge, speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex ... More

CAPE CANAVERAL, Fla. – Astrophysicist Dr. Neil deGrasse Tyson with the American Museum of Natural History’s Hayden Planetarium in New York, speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during prelaunch activities for the agency’s Gravity Recovery and Interior Laboratory (GRAIL) mission. Participants toured NASA’s Kennedy Space Center and got a close-up view of Space Launch Complex 17B at Cape Canaveral Air Force Station. The tweeters will share their experiences with followers through the social networking site Twitter. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon’s gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon’s crust and mantle and will help answer fundamental questions about the moon’s internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon’s gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Gianni Woods KSC-2011-6800

CAPE CANAVERAL, Fla. – Astrophysicist Dr. Neil deGrasse Tyson with the...

CAPE CANAVERAL, Fla. – Astrophysicist Dr. Neil deGrasse Tyson with the American Museum of Natural History’s Hayden Planetarium in New York, speaks to a group of Tweetup participants at the Kennedy Space Center ... More

CAPE CANAVERAL, Fla. – NASA Administrator Charlie Bolden speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during prelaunch activities for the agency’s Gravity Recovery and Interior Laboratory (GRAIL) mission. Participants toured NASA’s Kennedy Space Center and got a close-up view of Space Launch Complex 17B at Cape Canaveral Air Force Station. The tweeters will share their experiences with followers through the social networking site Twitter. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon’s gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon’s crust and mantle and will help answer fundamental questions about the moon’s internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon’s gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Gianni Woods KSC-2011-6788

CAPE CANAVERAL, Fla. – NASA Administrator Charlie Bolden speaks to a g...

CAPE CANAVERAL, Fla. – NASA Administrator Charlie Bolden speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during prelaunch activities for the agency’s Gravity Rec... More

CAPE CANAVERAL, Fla. – NASA Administrator Charlie Bolden speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during prelaunch activities for the agency’s Gravity Recovery and Interior Laboratory (GRAIL) mission. Participants toured NASA’s Kennedy Space Center and got a close-up view of Space Launch Complex 17B at Cape Canaveral Air Force Station. The tweeters will share their experiences with followers through the social networking site Twitter. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon’s gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon’s crust and mantle and will help answer fundamental questions about the moon’s internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon’s gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Gianni Woods KSC-2011-6787

CAPE CANAVERAL, Fla. – NASA Administrator Charlie Bolden speaks to a g...

CAPE CANAVERAL, Fla. – NASA Administrator Charlie Bolden speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during prelaunch activities for the agency’s Gravity Rec... More

CAPE CANAVERAL, Fla. – Robert Fogel, NASA’s GRAIL program scientist, participates in the Gravity Recovery and Interior Laboratory (GRAIL) mission science briefing in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6764

CAPE CANAVERAL, Fla. – Robert Fogel, NASA’s GRAIL program scientist, p...

CAPE CANAVERAL, Fla. – Robert Fogel, NASA’s GRAIL program scientist, participates in the Gravity Recovery and Interior Laboratory (GRAIL) mission science briefing in the NASA Press Site auditorium at NASA's Ken... More

CAPE CANAVERAL, Fla. – – A Gravity Recovery and Interior Laboratory (GRAIL) mission science briefing is held in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. From left are DC Agle, NASA Public Affairs; Robert Fogel, NASA’s GRAIL program scientist; Maria Zuber, GRAIL principal investigator with the Massachusetts Institute of Technology; Sami Asmar, GRAIL deputy project scientist, NASA’s Jet Propulsion Laboratory; and Leesa Hubbard, teacher in residence, Sally Ride Science, San Diego. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6769

CAPE CANAVERAL, Fla. – – A Gravity Recovery and Interior Laboratory (G...

CAPE CANAVERAL, Fla. – – A Gravity Recovery and Interior Laboratory (GRAIL) mission science briefing is held in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. From left are DC Agle, N... More

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral Air Force Station, preparations are under way to roll the mobile service tower away from the United Launch Alliance Delta II rocket that will launch NASA's Gravity Recovery and Interior Laboratory mission. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6770

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral ...

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral Air Force Station, preparations are under way to roll the mobile service tower away from the United Launch Alliance Delta II rocket that wil... More

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral Air Force Station, view of the United Launch Alliance Delta II rocket that will launch NASA's Gravity Recovery and Interior Laboratory mission is unobstructed as the mobile service tower rolls away. The "rollback" began at about 11:20 p.m. EDT. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6779

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral ...

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral Air Force Station, view of the United Launch Alliance Delta II rocket that will launch NASA's Gravity Recovery and Interior Laboratory missi... More

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral Air Force Station, the United Launch Alliance Delta II rocket that will launch NASA's Gravity Recovery and Interior Laboratory mission is ready for launch. Preparations are under way to roll the mobile service tower away from the rocket. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6771

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral ...

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral Air Force Station, the United Launch Alliance Delta II rocket that will launch NASA's Gravity Recovery and Interior Laboratory mission is re... More

CAPE CANAVERAL, Fla. – – Leesa Hubbard, teacher in residence, Sally Ride Science, San Diego, participates in the Gravity Recovery and Interior Laboratory (GRAIL) mission science briefing in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6768

CAPE CANAVERAL, Fla. – – Leesa Hubbard, teacher in residence, Sally Ri...

CAPE CANAVERAL, Fla. – – Leesa Hubbard, teacher in residence, Sally Ride Science, San Diego, participates in the Gravity Recovery and Interior Laboratory (GRAIL) mission science briefing in the NASA Press Site ... More

CAPE CANAVERAL, Fla. – – A Gravity Recovery and Interior Laboratory (GRAIL) mission science briefing is held in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. From left are Robert Fogel, NASA’s GRAIL program scientist; Maria Zuber, GRAIL principal investigator with the Massachusetts Institute of Technology; Sami Asmar, GRAIL deputy project scientist, NASA’s Jet Propulsion Laboratory; and Leesa Hubbard, teacher in residence, Sally Ride Science, San Diego. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6767

CAPE CANAVERAL, Fla. – – A Gravity Recovery and Interior Laboratory (G...

CAPE CANAVERAL, Fla. – – A Gravity Recovery and Interior Laboratory (GRAIL) mission science briefing is held in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. From left are Robert Fog... More

CAPE CANAVERAL, Fla. – – Sami Asmar, GRAIL deputy project scientist, NASA’s Jet Propulsion Laboratory, participates in the Gravity Recovery and Interior Laboratory (GRAIL) mission science briefing in the NASA Press Site auditorium at NASA's Kennedy Space Center in Florida. GRAIL is scheduled to launch Sept. 8 aboard a United Launch Alliance Delta II Heavy rocket from Cape Canaveral Air Force Station in Florida. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6766

CAPE CANAVERAL, Fla. – – Sami Asmar, GRAIL deputy project scientist, N...

CAPE CANAVERAL, Fla. – – Sami Asmar, GRAIL deputy project scientist, NASA’s Jet Propulsion Laboratory, participates in the Gravity Recovery and Interior Laboratory (GRAIL) mission science briefing in the NASA P... More

CAPE CANAVERAL, Fla. – Jim Adams, deputy director of planetary science at NASA Headquarters in Washington, speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during prelaunch activities for the agency’s Gravity Recovery and Interior Laboratory (GRAIL) mission. Participants toured NASA’s Kennedy Space Center and got a close-up view of Space Launch Complex 17B at Cape Canaveral Air Force Station. The tweeters will share their experiences with followers through the social networking site Twitter. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon’s gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon’s crust and mantle and will help answer fundamental questions about the moon’s internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon’s gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Gianni Woods KSC-2011-6793

CAPE CANAVERAL, Fla. – Jim Adams, deputy director of planetary science...

CAPE CANAVERAL, Fla. – Jim Adams, deputy director of planetary science at NASA Headquarters in Washington, speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during... More

CAPE CANAVERAL, Fla. – Stu Spath, chief spacecraft engineer with Lockheed Martin, speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during prelaunch activities for the agency’s Gravity Recovery and Interior Laboratory (GRAIL) mission. Participants toured NASA’s Kennedy Space Center and got a close-up view of Space Launch Complex 17B at Cape Canaveral Air Force Station. The tweeters will share their experiences with followers through the social networking site Twitter. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon’s gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon’s crust and mantle and will help answer fundamental questions about the moon’s internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon’s gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Gianni Woods KSC-2011-6798

CAPE CANAVERAL, Fla. – Stu Spath, chief spacecraft engineer with Lockh...

CAPE CANAVERAL, Fla. – Stu Spath, chief spacecraft engineer with Lockheed Martin, speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during prelaunch activities for... More

CAPE CANAVERAL, Fla. – Sami Asmar, GRAIL deputy project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, Calif., speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex in Florida during prelaunch activities for the agency’s Gravity Recovery and Interior Laboratory (GRAIL) mission. Participants toured NASA’s Kennedy Space Center and got a close-up view of Space Launch Complex 17B at Cape Canaveral Air Force Station. The tweeters will share their experiences with followers through the social networking site Twitter. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon’s gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon’s crust and mantle and will help answer fundamental questions about the moon’s internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon’s gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Gianni Woods KSC-2011-6795

CAPE CANAVERAL, Fla. – Sami Asmar, GRAIL deputy project scientist at N...

CAPE CANAVERAL, Fla. – Sami Asmar, GRAIL deputy project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, Calif., speaks to a group of Tweetup participants at the Kennedy Space Center Visitor Complex i... More

CAPE CANAVERAL, Fla. – Tweetup participants ask questions during prelaunch activities for NASA’s Gravity Recovery and Interior Laboratory (GRAIL) mission at the Kennedy Space Center Visitor Complex in Florida. Participants toured NASA’s Kennedy Space Center and got a close-up view of Space Launch Complex 17B at Cape Canaveral Air Force Station. The tweeters will share their experiences with followers through the social networking site Twitter. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon’s gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon’s crust and mantle and will help answer fundamental questions about the moon’s internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon’s gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Gianni Woods KSC-2011-6796

CAPE CANAVERAL, Fla. – Tweetup participants ask questions during prela...

CAPE CANAVERAL, Fla. – Tweetup participants ask questions during prelaunch activities for NASA’s Gravity Recovery and Interior Laboratory (GRAIL) mission at the Kennedy Space Center Visitor Complex in Florida. ... More

CAPE CANAVERAL, Fla. -- Television satellite trucks raise their antennas at Press Site 1 near Space Launch Complex 17B on Cape Canaveral Air Force Station during preparations to broadcast the launch of NASA's Gravity Recovery and Interior Laboratory mission. Liftoff aboard a United Launch Alliance Delta II Heavy rocket is scheduled for 8:37:06 a.m. EDT. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Ken Thornsley KSC-2011-6809

CAPE CANAVERAL, Fla. -- Television satellite trucks raise their antenn...

CAPE CANAVERAL, Fla. -- Television satellite trucks raise their antennas at Press Site 1 near Space Launch Complex 17B on Cape Canaveral Air Force Station during preparations to broadcast the launch of NASA's G... More

CAPE CANAVERAL, Fla. -- Launch preparations are under way as dawn breaks at Space Launch Complex 17B on Cape Canaveral Air Force Station for NASA's Gravity Recovery and Interior Laboratory mission aboard a United Launch Alliance Delta II Heavy rocket. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA KSC-2011-6802

CAPE CANAVERAL, Fla. -- Launch preparations are under way as dawn brea...

CAPE CANAVERAL, Fla. -- Launch preparations are under way as dawn breaks at Space Launch Complex 17B on Cape Canaveral Air Force Station for NASA's Gravity Recovery and Interior Laboratory mission aboard a Unit... More

CAPE CANAVERAL, Fla. – Astrophysicist Dr. Neil deGrasse Tyson with the American Museum of Natural History’s Hayden Planetarium in New York, speaks to a group of Tweetup participants at NASA Kennedy Space Center’s NASA Causeway launch viewing site in Florida during prelaunch activities for the agency’s Gravity Recovery and Interior Laboratory (GRAIL) mission. Participants toured the center and got a close-up view of Space Launch Complex 17B at Cape Canaveral Air Force Station. The tweeters will share their experiences with followers through the social networking site Twitter. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon’s gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon’s crust and mantle and will help answer fundamental questions about the moon’s internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon’s gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6815

CAPE CANAVERAL, Fla. – Astrophysicist Dr. Neil deGrasse Tyson with the...

CAPE CANAVERAL, Fla. – Astrophysicist Dr. Neil deGrasse Tyson with the American Museum of Natural History’s Hayden Planetarium in New York, speaks to a group of Tweetup participants at NASA Kennedy Space Center... More

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral Air Force Station, the United Launch Alliance Delta II rocket that will launch NASA's Gravity Recovery and Interior Laboratory mission undergoes final preparations for launch. The "rollback" of the mobile service tower began at about 11:20 p.m. EDT Sept. 7. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. Launch is scheduled for 8:37:06 a.m. EDT Sept. 8. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kim Shiflett KSC-2011-6786

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral ...

CAPE CANAVERAL, Fla. -- At Space Launch Complex 17B on Cape Canaveral Air Force Station, the United Launch Alliance Delta II rocket that will launch NASA's Gravity Recovery and Interior Laboratory mission under... More

CAPE CANAVERAL, Fla. -- Media representatives check the lighting at Press Site 1 near Space Launch Complex 17B on Cape Canaveral Air Force Station during preparations to photograph the launch of NASA's Gravity Recovery and Interior Laboratory mission. Liftoff aboard a United Launch Alliance Delta II Heavy rocket is scheduled for 8:37:06 a.m. EDT. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future lunar vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Ken Thornsley KSC-2011-6810

CAPE CANAVERAL, Fla. -- Media representatives check the lighting at P...

CAPE CANAVERAL, Fla. -- Media representatives check the lighting at Press Site 1 near Space Launch Complex 17B on Cape Canaveral Air Force Station during preparations to photograph the launch of NASA's Gravity... More

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