Russian Cosmonaut Alexei Leonov, the first human to walk in space, second from left, meets with Expedition 53 crew members, Mark Vande Hei of NASA, left, Alexander Misurkin of Roscosmos, and Joe Acaba of NASA, right, at the Gagarin Cosmonaut Training Center, Wednesday, Sept. 6, 2017 in Star City, Russia. The crew later departed for Baikonur, Kazakhstan in preparation for their launch Sept. 13 on the Soyuz MS-06 spacecraft for a five and a half month mission on the International Space Station. Photo Credit: (NASA/Bill Ingalls)

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