Yuri Alekseyevich Gagarin (Russian: Ю́рий Алексе́евич Гага́рин, IPA: ( ˈjʉrjɪj ɐljɪˈksjejɪvjɪtɕ ɡɐˈɡarjɪn); 9 March 1934 -- 27 March 1968 ) was a Soviet pilot and cosmonaut. He was the first human to journey into outer space when his Vostok spacecraft completed an orbit of the Earth on 12 April 1961.

Answer this question: who was the first person gone to space? Let's give stream of consciousness first:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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To answer the above question, the relevant sentence is: He was the first human to journey into outer space when his Vostok spacecraft completed an orbit of the Earth on 12 April 1961.
So, the final answer is Yuri Alekseyevich Gagarin.