CAPE CANAVERAL, Fla. -- A DragonEye proximity sensor developed by Space Exploration Technologies (SpaceX) is prepared for installation while space shuttle Discovery is in Orbiter Processing Facility-3 at NASA's Kennedy Space Center in Florida. DragonEye is a Laser Imaging Detection and Ranging (LIDAR) sensor that will be tested on Discovery's docking operation with the International Space Station. Discovery's STS-133 mission, targeted to launch Nov. 1, will be the second demonstration of the sensor, following shuttle Endeavour's STS-127 mission in 2009. The DragonEye sensor will guide SpaceX's Dragon spacecraft as it approaches and berths to the station on future cargo re-supply missions. The Dragon spacecraft is a free-flying, reusable spacecraft being developed by SpaceX, which is contracted by NASA's Commercial Orbital Transportation Services (COTS) program. Photo credit: NASA/Jim Grossmann KSC-2010-4677

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.

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