NASA astronaut Chris Cassidy performs a spacewalk in May to inspect and replace a pump controller box on the International Space Station. On Saturday, two astronauts will perform the first in a series of similar spacewalks to fix a broken cooling line on the ISS. AP hide caption

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Astronauts Ready For Marathon Spacewalks
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Canadian Space Agency astronaut Chris Hadfield strums his guitar, a Larrivee Parlor, on the International Space Station in December. NASA hide caption

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