Sputnik 1
Sputnik 1 was the first artificial Earth satellite launched by the Soviet Union on October 4, 1957. It was a 58 cm diameter polished metal sphere, with four external radio antennas to broadcast radio pulses. The satellite completed an orbit of the Earth every 96.2 minutes, transmitting radio signals back to Earth that could be monitored by amateur radio operators. The launch of Sputnik 1 marked the beginning of the Space Age and the opening of a new era of exploration and discovery beyond our planet.
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