KENNEDY SPACE CENTER, FLA. - The STS-115 crew members stride out of the Operations and Checkout Building eager to get to Launch Pad 39B and the start of their mission to the International Space Station. This is the second attempt at launch after a week's postponement due to weather and technical concerns. On the left side, front to back, are Pilot Christopher Ferguson and Mission Specialists Steven MacLean and Heidemarie Stefanyshyn-Piper. On the right side, front to back, are Commander Brent Jett and Mission Specialists Daniel Burbank and Joseph Tanner. On its second attempt for launch, Atlantis is scheduled to lift off at 11:41 a.m. EDT today from Launch Pad 39B. During the STS-115 mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station. This mission is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the ISS. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Kim Shiflett KSC-06pd2088

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CAPE CANAVERAL, Fla. -- To commemorate the history of the Space Shuttle Program's last external fuel tank, its intertank door is emblazoned with an ET-122 insignia. The tank is in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida after traveling 900 miles by sea from NASA's Michoud Assembly Facility in New Orleans aboard the Pegasus Barge. It eventually will be attached to space shuttle Endeavour for the STS-134 mission to the International Space Station. STS-134, targeted to launch in Feb. 2011, currently is scheduled to be the last mission in the shuttle program. The tank, which is the largest element of the space shuttle stack, was completed in 2002, modified during Return to Flight operations in 2003 and 2004, damaged during Hurricane Katrina in 2005, and then restored to flight configuration by Lockheed Martin Space Systems Company employees in 2008 at NASA's Marshall Space Flight Center in Alabama. Photo credit: NASA/Jack Pfaller KSC-2010-4904

KENNEDY SPACE CENTER, FLA. -- In the White Room on Launch Pad 39A at NASA's Kennedy Space Center, the closeout crew helps STS-122 Mission Specialist Leopold Eyharts don his parachute before entering space shuttle Atlantis for liftoff at 2:45 p.m. EST. Eyharts, who represents the European Space Agency, is making his first shuttle flight. The launch will be the third attempt for Atlantis since December 2007 to carry the European Space Agency's Columbus laboratory to the International Space Station. During the 11-day mission, the crew's prime objective is to attach the laboratory to the Harmony module, adding to the station's size and capabilities. Photo credit: NASA/Scott Haun, Rick Prickett KSC-08pd0234

STS-93 Mission Specialist Steven A. Hawley (Ph.D.) is checked out by white room closeout crew members before entering the orbiter Columbia. In the background is Mission Specialist Michel Tognini of France, waiting to enter Columbia. The white room is an environmental chamber at the end of the orbiter access arm that provides entry to the orbiter crew compartment. STS-93 is a five-day mission primarily to release the Chandra X-ray Observatory, which will allow scientists from around the world to study some of the most distant, powerful and dynamic objects in the universe. After Space Shuttle Columbia's July 20 and 22 launch attempts were scrubbed, the launch was again rescheduled for Friday, July 23, at 12:24 a.m. EDT. The target landing date is July 27 at 11:20 p.m. EDT KSC-99pp0967

STS-116 MS Higginbotham retrieves items from a drawer in the MDDK on Space Shuttle Discovery

STS-120 crew leaves the Operations and Checkout bldg at KSC

Kim Shiflett KSC-06pd2088

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KENNEDY SPACE CENTER, FLA. - The STS-115 crew members stride out of the Operations and Checkout Building eager to get to Launch Pad 39B and the start of their mission to the International Space Station. This is the second attempt at launch after a week's postponement due to weather and technical concerns. On the left side, front to back, are Pilot Christopher Ferguson and Mission Specialists Steven MacLean and Heidemarie Stefanyshyn-Piper. On the right side, front to back, are Commander Brent Jett and Mission Specialists Daniel Burbank and Joseph Tanner. On its second attempt for launch, Atlantis is scheduled to lift off at 11:41 a.m. EDT today from Launch Pad 39B. During the STS-115 mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station. This mission is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the ISS. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Kim Shiflett

Space Shuttle Program

The Space Shuttle program was the United States government's manned launch vehicle program from 1981 to 2011, administered by NASA and officially beginning in 1972. The Space Shuttle system—composed of an orbiter launched with two reusable solid rocket boosters and a disposable external fuel tank— carried up to eight astronauts and up to 50,000 lb (23,000 kg) of payload into low Earth orbit (LEO). When its mission was complete, the orbiter would re-enter the Earth's atmosphere and lands as a glider. Although the concept had been explored since the late 1960s, the program formally commenced in 1972 and was the focus of NASA's manned operations after the final Apollo and Skylab flights in the mid-1970s. It started with the launch of the first shuttle Columbia on April 12, 1981, on STS-1. and finished with its last mission, STS-135 flown by Atlantis, in July 2011.