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The Space Shuttle "Challenger" disaster occurred on January 28, 1986, when the NASA Space Shuttle orbiter "Challenger" (OV-099) (mission STS-51-L) broke apart 73 seconds into its flight, leading to the deaths of its seven crew members. Disintegration of the vehicle began after an O-ring seal in its right solid rocket booster (SRB) failed at liftoff.