MOSCOW, March 19, 2015 - Former Soviet cosmonaut Alexey Leonov speaks for the 50th anniversary of his spacewalk at the Space Memorial Museum in Moscow, Russia, March 19, 2015. Leonov was the first human to conduct extra-vehicular activity in space, exiting the capsule during the Voskhod-2 mission for 12-minute spacewalk on March 18, 1965.

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