1962-07-28 USSR Kosmos 7

Kosmos 7 was part of a series of Soviet Earth satellites designed to study outer space, the upper atmosphere, and the Earth itself. It transmitted scientific data and measurements back to Earth using multichannel telemetry systems equipped with onboard memory units. In addition to reconnaissance, the satellite was used to measure radiation for safety purposes during the flights of the Vostok 3 and Vostok 4 spacecraft.