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IN SPACE - JULY 8: In this handout photo provided by NASA, astronaut Piers J. Sellers, STS-121 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, waves to the camera in the Quest Airlock of the International Space Station prior to the start of the first scheduled session of extravehicular activity (EVA) July 8, 2006 in Space. Discovery is scheduled to be docked with the International Space Station until July 14 and return to Florida on July 16. (Photo by NASA via Getty Images)

IN SPACE - JULY 8:  In this handout photo provided by NASA, astronaut Piers J. Sellers, STS-121 mission specialist, attired in his Extravehicular Mobility Unit (EMU) spacesuit, waves to the camera in the Quest Airlock of the International Space Station prior to the start of the first scheduled session of extravehicular activity (EVA) July 8, 2006 in Space. Discovery is scheduled to be docked with the International Space Station until July 14 and return to Florida on July 16.  (Photo by NASA via Getty Images)