NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
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Mission STS-51L Challenger crew during emergency egress training. From left to right, front then back are; Ronald McNair (mission specialist), Gregory Jarvis (payload specialist), Christa McAuliffe (Teacher in Space participant), Judy Resnik (mission specialist) and Ellison Onizuka (mission specialist). Challenger exploded 73 seconds after lift-off from Kennedy Space Center, Florida, USA on 28 January 1986. The explosion occurred as a result of a failure of one of the O-rings in a seal on one of the booster rockets. A subsequent leakage of fuel triggered the explosion that killed all seven crew members.
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