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The Space Shuttle Challenger explosion occurred on January 28, 1986, when Space Shuttle Challenger (mission STS-51-L) broke apart 73 seconds into its flight, leading to the deaths of its seven crew members. The explosion occured because of a defect in O-ring. It failed to close one of the joints, which allows the outside air pressure in the gas causes the external tank for liquid hydrogen spill that caused a big disaster. The cost of replacing the Space Shuttle was $2 billion ($4.5 billion in today’s dollars). Cost of investigation, problem correction, and replacement of equipment lost $ 450 million cost 1986-1987 ($ 1 billion today).
