Soyuz 20 was a Soviet space mission launched on November 17, 1975. It was part of the Soyuz program and aimed to transport a crew to the Salyut 7 space station. The mission lasted for 14 days, during which the crew conducted scientific experiments and performed maintenance tasks on the station. The crew of Soyuz 20 included cosmonauts Viktor Gorbatko, Yuri Glazkov, and Vladimir Shatalov. This mission was notable for being the first to carry a crew to a space station for an extended stay, contributing valuable data to future long-duration missions in space.