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Astronauts Complete Successful Spacewalk to Fix Station

Two American astronauts have successfully repaired a crippled cooling system during a rare Christmas Eve spacewalk. It was the second spacewalk in less than a week for astronauts Rick Mastracchio and Mike Hopkins, and only the second Christmas Eve spacewalk ever performed. NASA ordered the spacewalks to revive a critical cooling loop at the International Space Station and install a new pump. All non-essential equipment had to be turned off when the line died on December 11, and many...

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