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Answer:

The Space Shuttle Challenger disaster was a fatal incident in the United States space program that occurred on Tuesday, January 28, 1986, when the Space Shuttle Challenger broke apart 73 seconds into its flight, killing all seven crew members aboard.

Explanation:

Space shuttle challenger broke up 73 seconds after liftoff. All 7 crew members were killed. It was the 25th flight .. got gases escaped from the o ring and made it break apart