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Celebrating May 1st in Moscow
USSR. Moscow. May 1, 1963. Soviet cosmonaut, Hero of the Soviet Union Pavel Romanovich Popovich (left) and the first person to fly into space, Hero of the Soviet Union, USSR pilot-cosmonaut Yuri Alekseyevich Gagarin (right) on Red Square during the celebration of May 1. Valentin Sobolev/TASS