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On 12 April 1961, Russian cosmonaut Yuri Gagarin became the first human to travel into space when he launched into orbit on the Vostok 3KA-3 spacecraft (Vostok 1).
Mariner 4 was the first spacecraft to fly by Mars, and the first to return close-up images of the Red Planet. Its blurry views of craters and bare ground led some scientists to think that Mars is similar to the moon.