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Challenger 25th anniversary

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National Aeronautics and Space Administration (NASA) administrator Charles Bolden lays a wreath at a Challenger memorial at Arlington National Cemetery in Arlington, Va., on Jan. 27, in commemoration of NASA's National Day of Remembrance. Jan. 28 marks the 25th anniversary of the explosion of the space shuttle Challenger, which killed seven astronauts in 1986.

PHOTO: Manuel Balce Ceneta/AP

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