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Space Shuttle Challenger
The NASA Space Shuttle Challenger was an Earth space exploration vehicle that was first launched in the early 1980s as one of a fleet of similar vehicles. On January 28, 1986, Challenger exploded soon after take off, killing her seven-member crew.
In the alternate reality created when John Crichton accidentally rode a wormhole back to Earth, but to the 1980s, he learned that his father, Jack Crichton, had been the pilot of the ill-fated mission, something he was not in the "real world." ("Kansas")