The was the world's first partially reusable low Earth orbital spacecraft system, operating 135 missions between 1981 and 2011. It was officially known as the Space Transportation System (STS) . The fleet consisted of six orbiters: Columbia , Challenger , Discovery , Atlantis , Endeavour , and the prototype Enterprise (which only performed atmospheric tests). Core Components
: Two thin, white rockets that provided the majority of lift during the first two minutes of flight before being recovered for reuse. nasa space shuttle
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A complete Space Shuttle stack during launch consisted of four primary parts: nasa space shuttle