Christa McAuliffe, left, and Barbara Morgan, right, laugh with each other during training in in the months before the Challenger mission. Sixteen years after Christa McAuliffe and six other astronauts died in the Challenger explosion, NASA announced Friday, April 12, 2002, that McAuliffe's fellow teacher and one-time understudy Barbara Morgan will ride aboard a shuttle in 2004.(AP Photo/NASA)
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