Space Shuttle Challenger Explosion
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NASA's space shuttle Challenger completed 10 missions before it broke apart during a launch in 1986, killing seven astronauts.
As if flying commercial planes wasn't stressful enough already, airlines are facing major safety issues because of SpaceX rocket explosions.
Forty years ago, Americans were shocked when the space shuttle Challenger exploded 73 seconds after it launched on a chilly day in Florida.