Stock Photo - NASA astronaut Piers Sellers' stroll through the International Space Station on May 21 may be in celebration of the completion of three successful space walks on the orbital outpost, performed outside by three of his crewmates working in pairs on three separate days, and supported inside by the other ten astronauts and cosmonauts.

Stock Photo: NASA astronaut Piers Sellers' stroll through the International Space Station on May 21 may be in celebration of the completion of three successful space walks.

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