Russian cosmonaut Alexander Misurkin, seen through the helmet of his spacesuit, takes part in a spacewalk training exercise at the cosmonaut training centre in Star City outside Moscow February 5, 2013. Misurkin, together with U.S. astronaut Christopher Cassidy and Russian cosmonaut Pavel Vinogradov, is preparing for a mission to the International Space Station in March 2013. REUTERS/Sergei Remezov (RUSSIA - Tags: SCIENCE TECHNOLOGY TRANSPORT)