Baikonur Cosmodrome

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Baikonur or Baykonur Cosmodrome

(both: bī'kəno͞or`), formerly secret aerospace launch complex, Qyzylorda prov., S central Kazakhstan, near Baikonur (originally, 1958–95, Leninsk) but c.200 mi (320 km) SW of the mining town of Baikonur, whose name it was given to mislead the curious. The first facilities were built in the mid-1950s and served as the center for the Soviet space program. In Aug., 1957, the site was used to test an intercontinental ballistic missile; less than two months later Sputnik I, the world's first artificial satellite, was launched from Baikonur. In 1961 human spaceflight began there when the Vostok piloted by Yuri GagarinGagarin, Yuri Alekseyevich
, 1934–68, Russian astronaut (cosmonaut), b. near Gzhatsk, RSFSR. He was the first in history to be rocketed into orbital space flight. His flight on Apr. 12, 1961, lasted 1 hr. 48 min. and circled the earth once.
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 was launched and orbited the earth, and all subsequent Soviet missions originated there. After the breakup of the USSR, the Cosmodrome reverted to Kazakhstan, but since the early 1990s it has been leased by Russia for its space program. It also is used for missions to the International Space Station.
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Designated Rimsat 2, the Gorizont launched from the Baikinour Cosmodrome by a Proton SL-12 rocket on April 20 "has taken up position at 142.