The first-ever artificial Earth satellite was launched on October 4, 1957. A group of talented Soviet scientists and designers headed by the founder of practical cosmonautics Sergey Korolev worked on his creation.
On October 4, 1957, the first artificial Earth satellite was injected into an elliptical orbit. At 315 seconds after the liftoff, the satellite separated from the launch vehicle, and, for the first time in human history, transmitted radio signals to Earth. Thus began the space age.