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In this image made from video provided by NASA, Italian astronaut Samantha Cristoforetti checks the helmet of astronaut Terry Virts inside the International Space Station on Wednesday, Feb. 25, 2015. Virts reported the water while he waited in the air lock for Wednesday's spacewalk to formally conclude. (AP Photo/NASA) ** FILE **

In this image made from video provided by NASA, Italian astronaut Samantha Cristoforetti checks the helmet of astronaut Terry Virts inside the International Space Station on Wednesday, Feb. 25, 2015. Virts reported the water while he waited in the air lock for Wednesday's spacewalk to formally conclude. (AP Photo/NASA) ** FILE **

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