Expedition 31 Preflight

Part of a Mir space station-era mockup module is seen in Building 2 at the Gagarin Cosmonaut Training Center, Tuesday, April 24, 2012 in Star City, Russia. The Russian Mir space station was the precursor to today's International Space Station, which was collaboratively built by Russia and the United States. Photo Credit: (NASA/Carla Cioffi)