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PHOTOS: NASA's Darkest Moments
NASA marks anniversaries of Challenger, Columbia, Apollo 1 accidents.
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PHOTOS: Challenger, Columbia, Apollo: NASA's Darkest Moments
The Apollo 13 astronauts did not know how badly their ship had been damaged until they jettisoned the ship's service module a few hours before re-entry -- and realized its side had been blown away.
(NASA)
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