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Kosmos-496

DOS-7K No. 2

DOS-7K No. 3

The editor would like to thank Michael Lutomski and his staff at Johnson Space Center, Houston, for corrections.

The Salyut era: First space stations

During the 1970s, the USSR launched a series of progressively sophisticated orbital laboratories serving as habitats for increasingly lenghty crew visits. They were preparing the foundation for permanent presence of humans in the Earth's orbit.

Key figures in the Soviet space program attending launch in Tyuratam in the mid 1970s (left to right): cosmonauts Georgy Beregovoy and Vladimir Shatalov, Designer General of NPO Energia Valentin Glushko, Minister of General Machine-building Sergey Afanasiev, Director of NPO Energia's ZEM experimental plant Konstantin Vachnadze and General Kerim Kerimov, the Chairman of the State Commission. Photo-collage by Anatoly Zak

The USSR begins enduring space station program

Faced with the loss of the Moon Race in 1969, Soviet space strategists conceived a detour of the national human space flight effort to a less expensive but what would turn out to be a lasting effort — the development of a long-term habitat in space.

Building the first Salyut

Conceived, designed and assembled in merely 16 months, Salyut-1 was the product of a three-shift, no-days-off working marathon and the epitome of improvisation. Many design decisions were made right “in the field” during the actual assembly of the station, with leading engineers keeping round-the-clock vigil at the Khrunichev production plant.

Design of the first Salyut space station

The Salyut space station, identified in the industrial documentation as 17K, structurally consisted of a transfer compartment with a diameter of 2.1 meters, followed by the main work section, in turn containing a science instrument compartment, and closed up with an instrument section.

The USSR orbits its first space station

On April 19, 1971, at 04:40 Moscow Time, a three-stage UR-500K (Proton) rocket lifted off from the "Right" pad at Site 81 in Tyuratam and a few minutes later successfully delivered into orbit the first 17K space station (No. 12101). Unknown to the world, the name Zarya (sunrise) had been painted on its body, however the official Soviet media announced it as Salyut-1.

The USSR launches first space station crew

Four days after the Salyut space station entered orbit on April 19, 1971, the first crew was also on its way. After one aborted launch attempt, the Soyuz-10 transport ship lifted off with three cosmonauts in early hours of April 23, 1971, and reached the station the following day, but then ran into a string of potentially dangerous problems just inches away from its destination.

Soyuz-11 begins a fateful expedition to Salyut

On June 6, 1971, three Soviet cosmonauts, assigned to the flight at the last minute, departed Earth aboard the Soyuz-11 spacecraft for a record-breaking month-long flight aboard the Salyut space station.

Soyuz-11 crew lost at landing

On June 30, 1971, the three members of the Soyuz-11 crew lost their lives just minutes from landing when their Descent Module suddenly depressurized on its way back to Earth from the Salyut orbital laboratory.

Kosmos-496: Fixing Soyuz-11 flaws

On June 26, 1972, the Soviet space program made its first major step on a difficult road to recovery from the Soyuz-11 disaster a year earlier. The upgraded version of the 7K-T vehicle orbited the Earth without crew in the autonomous flight under name Kosmos-496.

DOS-7K No. 2: A failed Salyut

On July 29, 1972, the USSR attempted to launch a second copy of the Salyut space station, however, its UR-500K (Proton) rocket failed to reach orbit, so the mission was never publicly announced.

DOS-7K No. 3: Skylab's challenger

On May 11, 1973, the USSR launched its fourth space station and the first major upgrade of the original Salyut design, just days ahead of the American Skylab. The 19-ton Soviet lab reached orbit as planned, but an immediate crisis put Soviet engineering and mission control teams to a severe test... Today, it is often only an asterisk in history books, but in 1973, the launch of DOS-3 produced a political earthquake across the Soviet space program and even got the KGB involved.

Soviet and Russian space station launches:

Soviet launches related to space station projects and solo Soyuz flights in 1971-1985:

This page is compiled and maintained by Anatoly Zak

Last update: May 11, 2023

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An early Soviet concept of a space station formulated at TsNIIMash research institute.

Soyuz launch to the Salyut-1 space station. Credit: RKK Energia

A possible view of the first Salyut space station in orbit. Credit: RKK Energia

After the loss of the first crew of the Salyut space station during landing, the pressure suits (right) were introduced for launch, landing and docking operations. Standard Pinguin suits (left) were worn during the work inside the station. Copyright © 2001 Anatoly Zak

The DOS-7K No. 2 space station.

Scale model of the second-generation Salyut space station, which included independently guided solar arrays. Copyright © 2001 Anatoly Zak

The US Apollo and the Soviet Soyuz spacecraft docked for eternity in the Smithsonian Air and Space Museum in Washington, D.C. Copyright © 2002 Anatoly Zak

A 3rd generation Salyut space station, differed from its predecessors by a second docking port and a capability to be refueled in orbit from Progress cargo ships. Copyright © 2001 Anatoly Zak

A scale model of the 3rd generation Salyut space station docked with two transport spacecraft -- the Progress cargo ship and the Soyuz manned spacecraft. Apparently, no photos of such configuration exist. Copyright © 2001 Anatoly Zak

The Orlan spacesuit, which had been used onboard the Mir space station. Copyright © 2001 Anatoly Zak

To negate influence of weightlessness after long-duration flights, the Salyut crewmembers were wearing Chibis suits at the end of their missions. The Chibis suits create low-pressure in the lower parts of the body, driving more blood toward legs as caused by gravity on Earth. Copyright © 2001 Anatoly Zak