It’s been 40 years since Challenger space shuttle exploded
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NASA's space shuttle Challenger completed 10 missions before it broke apart during a launch in 1986, killing seven astronauts ...
Because a teacher was going to space, millions of schoolchildren watched the Challenger lift off on Jan. 28, 1986. It ...
NASA's Space Shuttle Program, which ran from 1981 to 2011, was a complex and ambitious project that pushed the boundaries of ...
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