Richard Mastracchio

Astronauts Complete Rare Christmas Eve SpacewalkSpace station astronauts repaired a crippled cooling system during a rare Christmas Eve spacewalk Tuesday, braving a "mini blizzard" of noxious ammonia as they popped in a new pump.
NASA Orders Urgent Spacewalk Repairs At StationNASA has ordered up a series of urgent spacewalks to fix a broken cooling line at the International Space Station.

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