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Challenger was an American space shuttle that blew up seventy-three seconds after take-off on 28 January 1986, killing all seven of its crew. The Eighth Doctor once said that its explosion affected the odds NASA gave for there being a "major problem" with the space shuttles. Before the explosion, NASA said there was a one-in-a-hundred-thousand chance of there being a malfunction; afterwards, those odds went up to one-in-a-hundred. (PROSE: Father Time)