Space Shuttle Challenger disaster remembered
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Jan. 28, 1986, 7 spacefarers were killed when shuttle Challenger exploded midair after launching from Kennedy Space Center in Florida
NASA's space shuttle Challenger completed 10 missions before it broke apart during a launch in 1986, killing seven astronauts.
TODAY marks four decades since the Challenger space shuttle exploded just 73 seconds into its flight. Millions watched the disaster unfold live, as the tragedy was broadcast in schools and on TV