Challenger, NASA space shuttle
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NASA's space shuttle Challenger completed 10 missions before it broke apart during a launch in 1986, killing seven astronauts.
Wednesday marked 40 years since the space shuttle Challenger accident that killed seven crew members. The mission was not just to launch satellites but to launch the first teacher in space.
Read about the tragic Challenger space shuttle disaster and the story of Christa McAuliffe, a teacher who dreamed of going to space.