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In this Dec. 8, 2016 photo made available by NASA, astronaut Peggy Whitson floats through a tangle of cables inside the Columbus module aboard the International Space Station. Whitson was operating the Fluids System Servicer to refill coolant loops in multiple modules on the U.S. segment of the station. (NASA via AP)

In this Dec. 8, 2016 photo made available by NASA, astronaut Peggy Whitson floats through a tangle of cables inside the Columbus module aboard the International Space Station. Whitson was operating the Fluids System Servicer to refill coolant loops in multiple modules on the U.S. segment of the station. (NASA via AP)

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