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Apollo 13 mission became NASA's closest call

An April 1970 explosion forced Apollo 13 to use the lunar module as a lifeboat; crew rationed water and returned safely.
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Apollo 13 odyssey transfixed the nation, tested NASA's mettle

This story originally posted Sept. 17, 2016. It is being republished as part of the Chronicle's 125 series. By the time Apollo 13 launched in April 1970, Americans already had walked on the moon twice ...