In which year was the world’s first artificial satellite Sputnik 1 launched?
Sputnik 1 Sputnik 1 Sputnik 1 ( or ; "Satellite-1", or "PS-1", Простейший Спутник-1 or "Prosteyshiy Sputnik-1", "Elementary Satellite 1") was the first artificial Earth satellite. The Soviet Union launched it into an elliptical low Earth orbit on 4 October 1957, orbiting for three weeks before its batteries died, then silently for two more months before falling back into the atmosphere. 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
Sputnik 3 Sputnik 3 Sputnik 3 (, "Satellite 3") was a Soviet satellite launched on May 15, 1958 from Baikonur Cosmodrome by a modified R-7/SS-6 ICBM. It was a research satellite to explore the upper atmosphere and near space, and carried a large array of instruments for geophysical research. "Sputnik 3" was the only Soviet satellite launched in 1958. Like its American counterpart, "Vanguard 1", "Sputnik 3" had succeeded in making it into orbit during the International Geophysical Year. In July 1956, the Soviet Union's OKB-1 completed the preliminary design for the first Earth satellite, designated ISZ (Artificial Earth Satellite). ISZ was