Sputnik I Was First Satellite

Which was the first artificial satellite?

The first artificial satellite was Sputnik I. Orbited the earth on October 4, 1957. Sputnik 1 was the first Earth-orbiting artificial satellite. It was launched into an elliptical low Earth orbit by the Soviet Union on 4 October 1957, and was the first in a series of satellites collectively known as the Sputnik program.