Debris threatens Space Station

Associated Press
FILE - This May 23, 2011 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. The International Space Station may provide the setting for a 500-day pretend trip to Mars in another few years. NASA said Tuesday, March 20, 2012 that consideration is under way to use the space station as a dry run for a simulated trip to and from Mars. (AP Photo/NASA, Paolo Nespoli)

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A passing piece of potentially dangerous space debris forced astronauts at the International Space Station to temporarily seek refuge in escape ships early on Saturday, U.S. officials said.

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