Far Out Fix: U.S. Astronauts on Spacewalk Repairing International Space Station
NASA Flight Engineers Rick Mastracchio and Mike Hopkins are working outside the orbiting International Space Station today (Dec. 21) to fix a bad pump.
They are doing the first in a series of spacewalks to replace a degraded ammonia pump module with one of the station's two external cooling loops that keeps both internal and external equipment cool, according to NASA.