How Many Space Shuttles Have Crashed?

Only two space shuttles, the Challenger and the Columbia, have crashed. There have, however, been other deaths related to the space shuttle program.

The Space Shuttle Challenger Disaster: In January 1986, the Space Shuttle Challenger broke apart 73 seconds after liftoff, killing all seven crew members aboard. The incident was significant because it was the first time a civilian was flying on the shuttle. Teacher Christa McAuliffe was supposed to be the first teacher in space, creating video lessons for students around the world. The disaster was blamed on the failure of the O-rings due to the cold temperatures.