NASA says the astronauts on the United States space shuttle have completed the third and last space walk of their mission to the International Space Station.
The outing kept mission specialists Rick Mastracchio and Clayton Anderson outside the Space Station for six hours and 24 minutes on Tuesday. It was the sixth space walk for both astronauts.
During the space walk, they finished installing a new ammonia tank for the station's cooling systems, relocated a portable foot restraint and prepared cables on a truss for a space-to-ground Ku-band antenna.
