Soyuz 27

The Soviet Union launches Soyuz 27 on a mission to the Salyut 6 space station – the first instance of three vehicles being docked together in space. Cosmonauts Vladimir Dzhanibekov and Oleg Makarov spend six days with the crew of Soyuz 26 board the station, although Dzhanibekov and Makarov swap capsules with the station crew, leaving the newer vehicle at the station for their eventual return. The crew of Soyuz 27 is in space for less than a week, but their spacecraft remains in orbit, connected to Salyut, for over two months.