Seven.
The space shuttle Challenger broke apart upon launch caused by a failed O-ring.
The Space Shuttle Challenger disaster occurred on January 28, 1986 at 11:38 am EST, when Space Shuttle Challenger broke apart immediately after take off.
The space shuttle Challenger came apart on that date and subsequently crashed into the ocean. All seven astronauts were killed.
Two space shuttles have crashed: Challenger in 1986 and Columbia in 2003. Both incidents resulted in the loss of the crew on board.
Space shuttle Endeavour has not crashed. The shuttles Challenger and Columbia disintegrated in January 1986 and February 2003 respectively.
None crashed they broke apart and there were only two Space Shuttles that did so. Space Shuttle Challenger broke apart on take-off over the Atlantic Ocean in 1986 and Space Shuttle Columbia broke apart on re-entry over East Texas in 2003.
None of them crashed. Space Shuttle Challenger broke apart in 1986 due to a SRB explosion. Space Shuttle Columbia broke apart during reentry in 2003 due to a whole in it's left wing from foam from the ET hitting it during launch.
The space shuttle that exploded in 1986 was the Challenger.
The US space shuttle Challenger exploded on January 28, 1986.
The worst disaster for the space shuttle program was the Space Shuttle Challenger disaster in 1986. The shuttle disintegrated 73 seconds after launch, resulting in the loss of all seven crew members aboard.
Space shuttle Challenger exploded on the 28th of January 1986.
The space shuttle that exploded in 1986 was the Space Shuttle Challenger. It tragically disintegrated 73 seconds after launch, resulting in the loss of all seven crew members.