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PHOTOS: NASA's Darkest Moments
NASA marks anniversaries of Challenger, Columbia, Apollo 1 accidents.
PHOTOS: Challenger, Columbia, Apollo: NASA's Darkest Moments
Apollo 13, in April 1970, was one accident that ended in triumph. A damaged oxygen tank exploded as the astronauts approached the moon -- but through luck, ingenuity and endurance, the astronauts rode their crippled ship safely home.
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