NASA astronauts on Tuesday completed urgent repairs to the cooling system of the International Space Station that should return it to normal operation within a few days.
In a 7½-hour space walk, their second in four days, astronauts Col. Michael Hopkins of the Air Force and Richard Mastracchio installed a new pump module on the outside of the space station. The module, a 780-pound box about the size of a refrigerator, contains a pump and accompanying apparatus that circulate ammonia coolant through one of two loops on the station.
Operations on the space station, including some science experiments, have been curtailed since a valve in the pump module malfunctioned two weeks ago. The pump passed a brief check, and is to be turned on Tuesday evening.