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Two crew members on the International Space Station will spend their Christmas Eve taking a stroll through the vacuum as they finish up repairs to a faulty pump that threatened the stations cooling systems. A degraded ammonia pump module was removed from the stations exterior during a five-hour-plus spacewalk on Saturday, and a replacement pump will be installed in the empty slot on Tuesday. If all goes well, the entire repair job will be completed in just two spacewalks, and not the three that NASA originally anticipated. Saturdays walk was actually cut short after Flight Engineer Rick Mastracchio had trouble regulating the temperature in his space suit. Back in July, Italian astronaut Luca Parmitano of the European Space Agency nearly drowned when his helmet began to fill with water during a space walk, although the two water issues were unrelated.