Expedition 31 Soyuz commander Gennady Padalka signs a traditional cosmonauts' log at the site's Yuri Gagarin museum.

At the Gagarin Cosmonaut Training Center in Star City, Russia, outside Moscow, Expedition 31 Soyuz commander Gennady Padalka signs a traditional cosmonauts' log at the site's Yuri Gagarin museum. Padalka, along with NASA astronaut Joe Acaba, and cosmonaut Sergei Revin (not pictured) are preparing for the launch May 15 that will take them to the International Space Station on the Soyuz TMA-04M spacecraft from the Baikonur Cosmodrome in Kazakhstan. Photo credit: NASA/Stephanie Stoll