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The launch is October 4 1957, was launched during the International Geophysical Year from Site No.1/5, at the 5th Tyuratam range, in Kazakh SSR (now at the Baikonur Cosmodrome). The satellite travelled at 29,000 kilometers (18,000 mi) per hour, taking 96.2 minutes to complete an orbit, and emitted radio signals at 20.005 and 40.002 MHz[4] which were monitored by amateur radio operators throughout the world.[5] The signals continued for 22 days until the transmitter batteries ran out on 26 October 1957.[6] burned up on 4 January 1958, as it fell from orbit upon reentering Earth's atmosphere, after travelling about 60 million km (37 million miles) and spending 3 months in orbit.[7]INFO: WIKIPEDIA CUTS

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