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.
On a cold, sunny morning in Florida, after several scrubs due to weather, the launch was a highly-anticipated event.
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's iconic Discovery space shuttle, which launched dozens of times from Florida, may not be relocated to Houston for display.
Forty years ago, Americans were shocked when the space shuttle Challenger exploded 73 seconds after it launched on a chilly day in Florida.