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December 24, 2013 AT 5:03 AM
While many people may spend Christmas Eve doing last-minute shopping, two American astronauts have a more challenging matter to attend to Tuesday. In orbit more than 200 miles above Earth, flight engineers Rick Mastracchio and Mike Hopkins embarked on a spacewalk on Tuesday morning to repair part of the International Space Station's cooling system. It is the second Christmas Eve spacewalk in history, according to NASA.