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Astronauts attempt to fix ammonia leak

FLORIDA

CAPE CANAVERAL — Astronauts made a rare, hastily planned spacewalk to replace a pump outside the International Space Station in hopes of plugging an ammonia leak. Mission Control said it appeared as though the leak may have been plugged, although additional monitoring in the coming days, if not weeks, will be needed before declaring a victory. Christopher Cassidy and Thomas Marshburn installed the new pump after removing an old one suspected of spewing flakes of frozen ammonia coolant two days earlier. The leak, though significant, posed no threat to the crew.

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