April 19, 1971 (, Xinhai March 24), the Soviet Union, "a salute navigation days station the first launch. First launch the Salyut 1 space station

Soviet Union on April 19, 1971. It is run in a fixed orbit manned satellites, used as a base for scientific observation and experiment, and can be used to add fuel to other spacecraft or launch satellites and missiles from above. Salyut 1 space station weight of 8610 kg, 7.6 m in length, the original design of the permanent track, but the track is low, six months after it entered the Earth's atmosphere failed.