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Space Station astronauts undertake second of three spacewalks

Science - Space

International space station commander Mike Lopez-Alegria and Sunita Williams have embarked on a second spacewalk to continue work on the station's new cooling system.

The two are scheduled to finish connecting cooling loops to the station's new permanent cooling system by Sunday afternoon, a task which poses the risk of the toxic amonia contaminating their suits. They were forced to spend an extra 25 minutes in the station's airlock after their first spacewalk to work on the cooling system, after they encountered but a few drops of amonia. Were they to bring it back into the station on their suits it could have been enough to contaminate the station's air supply. The crew takes extra precautions after astronaut Robert Curbeam's spacesuit was contaminated with amonia during whilst working outside the station in 2001.

Today's spacewalk was the second of three planned over the next nine days, the most ever undertaken in such a short space of time without a space shuttle docked at the station. With only a three-person crew, only one crew mate is available to help the astronauts suit up for spacewalks - today Russian cosmonaut Mikhail Tyurin - and assist by operating the station's robotic arms and cameras.

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