At the Gagarin Cosmonaut Training Center in Star City Russia is seen inside a Russian segment systems mockup.

At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 51 crewmember Jack Fischer of NASA is seen inside a Russian segment systems mockup on a TV monitor being viewed by trainers March 30 as he and Fyodor Yurchikhin of the Russian Federal Space Agency (Roscosmos) began two days of final qualification exams. Fischer and Yurchikhin will launch April 20 on the Soyuz MS-04 spacecraft from the Baikonur Cosmodrome in Kazakhstan for a four and a half month mission on the International Space Station. Credit: NASA/Rob Navias