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Retired NASA Astronaut Mark Kelly, left, fist pumps his identical twin brother, NASA Astronaut Scott Kelly through glass as Scott Kelly and fellow crew mates, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) participate in a press conference while in quarantine Thursday, March 26, 2015, at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of space shuttle Endeavour, will participate in biomedical studies on the ground while his twin is on board the orbiting laboratory. Scott Kelly, Kornienko, and Padalka launched to the International Space Station in the Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time (March 27 Eastern time). (Photo by /Bill Ingalls/NASA)
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