Oleg Ivanovsky

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In this April 12 1961 photo, rocket engineer Oleg Ivanovsky pats Yuri Gagarin, left, on his helmet as he sits down in the cockpit of the Vostok spacecraft before the launch from what will later become known as the Baikonur cosmodrome. Ivanovsky said that designers had done their best to make the first human flight into space safe, but risks were still high. Russia is marking the 50th anniversary of man's first trip into space. (AP Photo/NPO Lavochkin Museum, HO)