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In this image made from video provided by NASA, U.S. astronauts Peggy Whitson, above, and Shane Kimbrough work on the outside of the International Space Station on Thursday, March 30, 2017. An important piece of micrometeorite shielding was lost during the spacewalk. (NASA via AP)

In this image made from video provided by NASA, U.S. astronauts Peggy Whitson, above, and Shane Kimbrough work on the outside of the International Space Station on Thursday, March 30, 2017. An important piece of micrometeorite shielding was lost during the spacewalk. (NASA via AP)

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