FILE - This May 23, 2011 file photo released by NASA shows 

FILE - This May 23, 2011 file photo released by NASA shows the International Space Station at an altitude of approximately 220 miles above the Earth, taken by Expedition 27 crew member Paolo Nespoli from the Soyuz TMA-20 following its undocking. NASA on Thursday, May 9, 2013 said the International Space Station has a radiator leak in its power system. The outpost's commander calls the situation serious, but not life-threatening. (AP Photo/NASA, Paolo Nespoli, File)
Associated Press
FILE - This May 23, 2011 file photo released by NASA shows the International Space Station at an altitude of approximately 220 miles above the Earth, taken by Expedition 27 crew member Paolo Nespoli from the Soyuz TMA-20 following its undocking. NASA on Thursday, May 9, 2013 said the International Space Station has a radiator leak in its power system. The outpost's commander calls the situation serious, but not life-threatening. (AP Photo/NASA, Paolo Nespoli, File)
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