Soyuz 20 (russian: Союз 20, Union 20) was an unmanned spacecraft launched by the

Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, ...

. It was a long-duration test of the Soyuz spacecraft that docked with the Salyut 4 space station. Soyuz 20 performed comprehensive checking of improved on-board systems of the spacecraft under various flight conditions. It also carried a biological payload. Living organisms were exposed to three months in space.

Mission parameters

*Mass: *Perigee: *Apogee: *Inclination: 51.6° *Period: 88.8 minutes

Return

It was recovered on 16 February 1976 at 02:24 UTC.

References

{{Orbital launches in 1975 Soyuz uncrewed test flights Spacecraft launched in 1975 Spacecraft which reentered in 1976 Spacecraft launched by Soyuz-U rockets