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In 1986, tragedy struck the American space program. On a cold winter morning, the space shuttle Challenger blasted off. A few seconds after launch, while the world watched on television, the shuttle exploded, killing seven astronauts: Francis Scobee, Judith Resnick, Ronald McNair, Michael Smith, Sharon Christa McAuliffe, Ellison Onizuka, and Gregory Jarvis. It was the worst disaster in the history of the American space program.