
The Soyuz TMA-18 blast stands on Baikonur cosmodrome in Kazakhstan before carrying members of the 18th mission U.S. astronaut Tracy Caldwell Dyson, Russian cosmonauts Alexander Skvortsov and Mikhail Korniyenko to the International Space Stationin, 02 April 2010. EPA/YURI KOCHETKOV

The Soyuz TMA-18 blast off from Baikonur cosmodrome in Kazakhstan, 02 April 2010, carrying members of the 18th mission U.S. astronaut Tracy Caldwell Dyson, Russian cosmonauts Alexander Skvortsov and Mikhail Korniyenko to the International Space Station. EPA/YURI KOCHETKOV

The Soyuz TMA-18 blasts off from Baikonur cosmodrome in Kazakhstan, 02 April 2010, carrying members of the 18th mission U.S. astronaut Tracy Caldwell Dyson, Russian cosmonauts Alexander Skvortsov and Mikhail Korniyenko to the International Space Station. EPA/YURI KOCHETKOV

The Soyuz TMA-18 blast off from Baikonur cosmodrome in Kazakhstan, 02 April 2010, carrying members of the 18th mission U.S. astronaut Tracy Caldwell Dyson, Russian cosmonauts Alexander Skvortsov and Mikhail Korniyenko to the International Space Station. EPA/YURI KOCHETKOV

The Soyuz TMA-18 blasts off from Baikonur cosmodrome in Kazakhstan, 02 April 2010, carrying members of the 18th mission U.S. astronaut Tracy Caldwell Dyson, Russian cosmonauts Alexander Skvortsov and Mikhail Korniyenko to the International Space Station. EPA/YURI KOCHETKOV

Members of expedition to the International Space Station U.S. astronaut Tracy Caldwell Dyson (C), Russian cosmonauts Alexander Skvortsov (Bottom), and Mikhail Korniyenko wave during the farewell ceremony as they get up into the spacecraft Soyuz TMA-18 before the launch at Baikonur cosmodrome in Kazakhstan, 02 April 2010. EPA/YURI KOCHETKOV