Stock Photo - At the Gagarin Cosmonaut Training Center in Star City, Russia, outside Moscow, Expedition 31 backup crew members -- Russian cosmonauts Evgeny Tarelkin (left), Oleg Novitskiy (center) and NASA astronaut Kevin Ford (right) -- pose before the site's Yuri Gagarin statue April 25, 2012 following their press conference. Expedition 31 prime crew members Joe Acaba of NASA and cosmonauts Gennady Padalka and Sergei Revin (not pictured) -- are scheduled to launch on May 15 from the Baikonur Cosmodrome in Kazakhstan to the International Space Station.

Stock Photo: At the Gagarin Cosmonaut Training Center in Star City, Russia, outside Moscow, Expedition 31 backup crew members -- Russian cosmonauts Evgeny Tarelkin (left).

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