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May 11, 2013 6:09 PM by Zach Thaxton

Astronauts conduct spacewalk to fix ISS ammonia leak

CAPE CANAVERAL, Fla. (AP) - NASA says it could be weeks before it knows whether today's spacewalk was a success.

Two astronauts ventured out of the International Space Station to replace a pump, in hopes of plugging a serious leak of ammonia. Since the new pump was installed, no frozen flecks of ammonia have appeared, and Mission Control says it looks like the leak may have been plugged.

The leak never jeopardized the safety of the crew.

NASA will continue to watch for any seepage.

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