Soyuz 35 (Russian: Союз 35, Union 35) was a 1980 Soviet manned space flight to the Salyut 6 space station. It was the 10th mission to and eighth successful docking at the orbiting facility. The Soyuz 35 crew were the fourth long-duration crew to man the space station.
Cosmonauts Leonid Popov and Valery Ryumin spent 185 days in space, setting a new space endurance record. Ryumin had completed a previous mission only eight months before. They hosted four visiting crews, including the first Hungarian, Cuban and Vietnamese cosmonauts.
As long-duration crews now routinely swapped spacecraft with incoming crew, the Soyuz 35 craft was used to return the visiting Soyuz 36 crew to Earth, while the resident crew returned in Soyuz 37.
Read more about Soyuz 35: Crew, Mission Parameters, Crew Launch, Station Activation, Soyuz 36 and Soyuz T-2 Crews Visit, First Asian and Cuban Cosmonauts, End of Mission