What is the name of the first man-made object to orbit the Earth?
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Sputnik 1 was the first artificial Earth satellite. The Soviet Union launched it into an elliptical low Earth orbit on 4 October 1957. It was a 58 cm (23 in) diameter polished metal sphere, with four external radio antennas to broadcast radio pulses. Its radio signal was easily detectable even by radio amateurs,and the 65° inclination and duration of its orbit made its flight path cover virtually the entire inhabited Earth. This surprise success precipitated the American Sputnik crisis and triggered the Space Race, a part of the Cold War. The launch ushered in new political, military, technological, and scientific developments
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Vanguard 1 can't claim to be the first artificial satellite in Earth orbit that distinction belongs to Soviet launched Sputnik 1 Vanguard 1 is actually the fourth artificial satellite - after Sputnik 1 ( USSR ) , Sputnik 2 ( USSR ) and Explorer 1 ( USA ) .
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