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The Soviet cosmonaut Yuri Gagarin became the first human in space when he entered orbit in the Soviet Union's Vostok on April 12, 1961, a day now celebrated as a holiday in Russia and in many other countries. He orbited the Earth for 108 minutes. The lead architects behind the Vostok 1 mission were the Soviet rocket scientists Sergey Korolyov and Kerim Kerimov.[5]

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