NASA saw the Challenger failure coming years before it happened. ⚠️ . . . On later shuttle flights STS 41-B and STS 51-C, engineers found solid rocket booster O-rings burned by hot gas — a design flaw at cold temperatures. Morton Thiokol engineer Roger Boisjoly begged managers on January 27, 1986 to delay launch as temperatures dropped to 18°F. He was overruled. Challenger broke apart 73 seconds after liftoff.
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