KENNEDY SPACE CENTER, FLA. - Inside the Vehicle Assembly Building at NASA's Kennedy Space Center, a solid rocket booster segment (upper left) is mated with the lower segment. The booster is part of the shuttle stack for Discovery and mission STS-121. Launch of Discovery is scheduled for no earlier than May. Photo credit: NASA/Jack Pfaller KSC-06pd0256
Summary
KENNEDY SPACE CENTER, FLA. - Inside the Vehicle Assembly Building at NASA's Kennedy Space Center, a solid rocket booster segment (upper left) is mated with the lower segment. The booster is part of the shuttle stack for Discovery and mission STS-121. Launch of Discovery is scheduled for no earlier than May. Photo credit: NASA/Jack Pfaller
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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