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August 7: In this image taken from video and made available by NASA, astronauts Douglas Wheelock, right, and Tracy Caldwell Dyson begin work on the International Space Station to replace a broken ammonia pump.![Spacewalk Repairs]()
August 7: In this image taken from video and made available by NASA astronaut Doug Wheelock begins the first of two spacewalks to replace a broken ammonia pump.![Spacewalk Repairs]()
August 7: In this image taken from video and made available by NASA astronaut Doug Wheelock, foreground begins the first of two spacewalks to replace a broken ammonia pump.![Spacewalk Repairs]()
August 7: In this image taken from video and made available by NASA, astronauts Douglas Wheelock, top, and Tracy Caldwell Dyson work on the International Space Station to restore a crucial cooling system Their mission was to replace a broken ammonia coolant pump, a job considered so difficult that two spacewalks are required.![Spacewalk Repairs]()
August 7: In this image taken from video and made available by NASA, astronaut Douglas Wheelock works on the International Space Station to restore a crucial cooling system. The mission was to replace a broken ammonia coolant pump, a job considered so difficult that two spacewalks are required.![Spacewalk Repairs]()
August 7: In this image taken from video and made available by NASA, the NASA command center is supervising the work being done on the International Space Station to restore a crucial cooling system.![Spacewalk Repairs]()
This February 19 file photo provided by NASA shows the International Space Station with Earth's horizon as a backdrop. Several power systems have been shut down aboard the International Space Station after a cooling system malfunctioned. NASA says that one of two cooling loops aboard the space station was shut down July 31.![Spacewalk Repairs]()
In this April 11 file photo, NASA astronaut Rick Mastracchio, STS-131 mission specialist, is on a spacewalk to swap an ammonia tank on the International Space Station.Spacewalk Repairs on the International Space Station
Astronauts aboard the International Space Station have opened a hatch on the space station to begin a spacewalk to remove a failed pump module from the station’s cooling system.
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- Spacewalk Repairs on the International Space Station
