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STS-51-L
STS-51-L was the 25th flight of the American Space Shuttle program, using the Space Shuttle ''Challenger'', which lifted-off from Launch Complex 39-B, at the Kennedy Space Center in Florida, on January 28, 1986. The mission ended in catastrophic failure with the destruction of ''Challenger'', starting at 73 seconds after lift-off, and the death of all seven crew members. The Rogers Commission determined that the cause of the destruction was due to the failure of an O-ring seal on the starboard Solid Rocket Booster (SRB). This flight marked the first time a non-government civilian, schoolteacher Christa McAuliffe, had flown aboard the Space Shuttle.
==Planned mission==
The tenth mission for ''Challenger'', STS-51-L was scheduled to deploy the second in a series of Tracking and Data Relay Satellites, carry out the first flight of the Shuttle-Pointed Tool for Astronomy (SPARTAN-203) / Halley's Comet Experiment Deployable in order to observe Halley's Comet, and carry out several lessons from space as part of the Teacher in Space Project and Shuttle Student Involvement Program (SSIP). The flight marked the first American orbital mission to involve in-flight fatalities. It was also the first American human spaceflight mission to launch and fail to reach space; the first such mission in the world had been the Soviet Soyuz 18a mission, in which the two crew members had survived. Gregory Jarvis was originally scheduled to fly on the previous shuttle flight (STS-61-C), but he was re-assigned to this flight and replaced by Congressman Bill Nelson. Initially, Caroll Spinney was asked to join the mission to perform as Big Bird, but NASA scrapped the plan when it was determined that the puppeteer's suit would not fit aboard the shuttle. McAuliffe was subsequently selected in his place.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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