NASA Astronaut Jack Fischer Prepares for Friday Spacewalk
Expedition 51 Flight Engineer Jack Fischer of NASA is seen inside the International Space Station (ISS) in his spacesuit during a fit check, in preparation for a spacewalk on May 12, 2017. Fischer and Expedition 51 Commander Peggy Whitson of NASA will exit the station's Quest airlock to replace an avionics box that routes command and data information to external science experiments. This will be the 200th spacewalk at the station for assembly and maintenance, the ninth spacewalk for Whitson and the first for Fischer. NASA/UPI
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