NASA, Challenger and Kennedy Space Center
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Challenger exploded 73 seconds after liftoff while carrying seven people, including "Teacher in Space" participant Christa McAuliffe. Nobody survived the launch on Jan. 28, 1986 from NASA's Kennedy Space Center, and the event left a permanent mark upon the agency, its contractors and the nation.
NASA's Space Shuttle Program, which ran from 1981 to 2011, was a complex and ambitious project that pushed the boundaries of space exploration, but was marred by two tragic accidents during the shuttle era.
NASA Administrator Jared Isaacman appeared to suggest that space shuttle Discovery may not be relocated to Houston's Johnson Space Center in Texas.