This event marks the launch of the Sputnik 28 satellite, a Soviet satellite that was launched in 1962. The satellite was part of the Soviet Union's space exploration program and was the first satellite to be launched into orbit. The launch of the satellite marked a major milestone in the history of
From Wikipedia
Sputnik 1, often referred to as simply Sputnik, was the first artificial Earth satellite. It was launched into an elliptical low Earth orbit by the Soviet Union on 4 October 1957 as part of the Soviet space program. It sent a radio signal back to Earth for three weeks before its three silver-zinc batteries became depleted. Aerodynamic drag caused it to fall back into the atmosphere on 4 January 1958.