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On this day in 1986, the Space Shuttle Challenger exploded over the Atlantic Ocean: A little more than a minute after launch and high above Kennedy Space Center, shuttle Challenger was ripped apart after failure of a rubber seal allowed a spurt of rocket flame to ignite the spacecraft's giant fuel tank. The roiling plume of Challenger's disintegration would sear an image in the nation's psyche that spoke of a particular sorrow; among seven astronauts killed 30 years ago [today] was teacher Christa...