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Sergei Korolev was a Soviet rocket scientist who is considered one of the founding fathers of the Soviet space program. He was responsible for the development of the R-7 rocket, which was used to launch Sputnik 1, the first artificial satellite to orbit the Earth. Korolev was also responsible for the development of the Vostok rocket, which was used to launch Yuri Gagarin, the first human to travel into space.