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Astronauts begin urgent repairs to International Space Station

Astronauts began the first of several critical repairs Saturday required to fix a damaged cooling line aboard the International Space Station orbiting the Earth.Watch the repairs live below. Live streaming video by UstreamThe operation began earlier this morning and is expected to continue until about 1:30 p.m. EST. American astronauts Rick Mastracchio and Michael Hopkins are replacing an ammonia pump containing a bad valve.The space station has been operating in a limited capacity since the cooling system was turned off ...

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