In this image made from video provided by NASA, Russian cosmonauts Pavel Vinogradov, left, and Roman Romanenko perform a spacewalk outside the International Space Station to gather old science experiments and install new ones, and replace a navigation device. (AP Photo/NASA)

Associated Press
In this image made from video provided by NASA, Russian cosmonauts Pavel Vinogradov, left, and Roman Romanenko perform a spacewalk outside the International Space Station to gather old science experiments and install new ones, and replace a navigation device. (AP Photo/NASA)
In this image made from video provided by NASA, Russian cosmonauts Pavel Vinogradov, left, and Roman Romanenko perform a spacewalk outside the International Space Station to gather old science experiments and install new ones, and replace a navigation device. (AP Photo/NASA)
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