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Two NASA astronauts began a high-stakes series of spacewalks to repair the International Space Station’s cooling system on Saturday, outfitted for the first time with snorkels in their helmets to keep them from drowning.
Photo: Backdropped by Earth, the International Space Station is seen in this image captured by one of the space shuttle Endeavour’s astronauts in 2010. (NASA/Reuters via NBCNews.com)