25th Space Shuttle Mission10th Flight of Challenger Crew:Francis R. Scobee, CommanderMichael J. Smith, PilotJudith A. Resnik, Mission SpecialistEllison S. Onizuka, Mission SpecialistRonald E. McNair, Mission SpecialistSharon Christa McAuliffe, Teacher in SpaceGregory B. Jarvis, Payload Specialist The mission featured America's "Teacher in Space" Sharon Christa McAuliffe. McAuliffe was scheduled to teach lessons from space which would be distributed live via satellite to schools throughout the world. The primary payload was the Tracking and Data Relay Satellite-2 (TDRS-2), originally scheduled to fly aboard canceled mission STS-51E. An explosion 73 seconds after launch resulted in the loss of Challenger and crew. For more information, visit the official NASA Challenger Site. Also be sure to visit one of the Challenger Centers created as an educational memorial to those friends we lost.