The main cause of the explosion was the failure of the aft joint (O ring) seal in the right SRB due to the cold weather. It had frozen over in the night, and when the aircraft blasted off, it over heated which caused the ring to fail. A combustion gas leak, which occurred in the right Solid Rocket Motor aft field joint initiated at or shortly after ignition, eventually penetrating the External Tank initiating vehicle structural breakup and loss of the Space Shuttle "The Challenger" during STS Mission 51-L.
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