The SpaceX Dragon commercial cargo craft backs away from the International Space Station's Canadarm2 robotic arm early on Tuesday, March 26, 2013, for its return to Earth. The Dragon is expected to splash down in the eastern Pacific Ocean approximately 246 miles off the coast of Baja California later in the morning. (AP Photo/NASA)
A Soyuz-FG rocket booster with Soyuz TMA-06M space ship carrying a new crew to the International Space Station blasts off from the Russian-leased Baikonur cosmodrome in Kazakhstan on Tuesday, Oct. 23, 2012. (AP Photo/Mikhail Metzel)
Members of the next expedition to the International Space Station — (from left) U.S. astronaut Kevin Ford and and Russian cosmonauts Oleg Novitsky and Evgeny Tarelkin — stand in front of St Basil's Cathedral in Red Square in Moscow on Tuesday, Sept. 25, 2012. The three are scheduled to blast off to the International Space Station from the Baikonur cosmodrom on a Russian-made Soyuz spacecraft on Tuesday, Oct. 23, 2012. (AP Photo/Mikhail Metzel)
SpaceX's Falcon 9 rocket successfully lifts off from Cape Canaveral Air Force Station in Florida on Sunday, Oct. 7, 2012, to take supplies to the International Space Station. (AP Photo/Florida Today, Malcolm Denemark)
A Soyuz-FG rocket booster with a Soyuz TMA-05M spaceship carrying a new crew to the International Space Station blasts off from the Russian-leased Baikonur cosmodrome in Kazakhstan on Sunday, July 15, 2012. (AP Photo/Dmitry Lovetsky)