Stock Photo - At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 54-55 backup crewmember Sergey Prokopyev of the Russian Federal Space Agency (Roscosmos) signs in for the crew's final qualification exam activities Nov. 28. Prokopyev, NASA's Jeanette Epps (left) and Alexander Gerst of the European Space Agency (right) are serving as backups to the prime crew, Anton Shkaplerov of Roscosmos, Scott Tingle of NASA and Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA), who will launch Dec. 17 on their Soyuz MS-07 spacecraft for a five-month mission on the International Space Station. Credit: NASAElizabeth Weissinger

Stock Photo: At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 54-55 backup crewmember Sergey Prokopyev of the Russian Federal Space Agency.

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