1 inch pin. 25th Space Shuttle Mission 10th Flight of Challenger Crew: Francis R. Scobee, Commander Michael J. Smith, Pilot Judith A. Resnik, Mission Specialist Ellison S. Onizuka, Mission Specialist Ronald E. McNair, Mission Specialist Sharon Christa McAuliffe, Teacher in Space Gregory 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.