In this image provided by NASA astronaut Nicole Stott, Expedition 20 flight engineer, participates in the STS-128 mission's first session of extravehicular activity on the International Space Station Sept. 1, 2009. Two deployed radiators are visible behind Stott. The International Space Station has a radiator leak in its power system. The outpost's commander calls the situation serious, but not life-threatening. The six-member crew on Thursday May 9, 2013 noticed white flakes of ammonia leaking out of the station. (AP Photo/NASA)
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