Space Shuttle Challenger disaster remembered
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Seven astronauts lost their lives during the Challenger space shuttle disaster on Jan. 28, 1986. Four decades later, human spaceflight remains a difficult business.
Tragedy killed seven crew members 73 seconds into flight
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