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Kosmos 936 / Bion 4
NamesBion 4
Mission typeBioscience
OperatorInstitute of Biomedical Problems
COSPAR ID1977-074A [1]
SATCAT no.10172
Mission duration19.5 days
Spacecraft properties
Spacecraft typeBion
Launch mass4,000 kg (8,800 lb) [1]
Start of mission
Launch date3 August 1977, 14:01:00 UTC
RocketSoyuz 11A511U s/n D15000-113
Launch sitePlesetsk, Site 43/3
End of mission
Recovered bySoviet Space Forces
Landing date22 August 1977, 01:05 UTC
Landing site51°53′N 61°30′E / 51.883°N 61.500°E / 51.883; 61.500 (Bion 4 spashdown)
near Kustanay, Kazakhstan, Soviet Union[2]
Orbital parameters
Reference systemGeocentric orbit
RegimeLow Earth orbit
Perigee altitude224 km (139 mi)
Apogee altitude419 km (260 mi)
Period90.70 minutes

Kosmos 936 or Bion 4 [3] (Бион 4, Космос 936) was a Bion satellite. The mission involved nine countries in a series of biomedical research experiments. The experiments were primarily follow-ups to the Bion 3 (Kosmos 782) flight. Scientists from the Bulgaria, Czechoslovakia, East Germany, France, Hungary, Poland, Romania, Soviet Union and the United States conducted experiments in physics and biology on the mission.[1]


The spacecraft was based on the Zenit reconnaissance satellite and launches began in 1973 with primary emphasis on the problems of radiation effects on human beings. Launches in the program included Kosmos 110, 605, 670, 782, plus Nauka modules flown on Zenit-2M reconnaissance satellites. 90 kg of equipment could be contained in the external Nauka module.[1]


Kosmos 936 was launched on 3 August 1977, by a Soyuz launch vehicle from Plesetsk Cosmodrome, Soviet Union. The mission ended after 19.5 days.[1]


Artificial gravity experiment that was flown on Bion 4.
Artificial gravity experiment that was flown on Bion 4.

The mission was to conduct various biological studies, continuing the Bion 3 mission experiments. He had two centrifuges on board to put some specimens in an artificial gravity environment. An attempt was made to differentiate, using rats, between the effects caused by space flight itself from those caused by stress. The effects of flight on muscle and bone, on red cell survival, and on lipid and carbohydrate metabolism were also studied, and an experiment with rats on the effects of space radiation on the retina was conducted.

One of the instruments (without a biological part) studied the physical parameters of the components of space radiation. Fruit flies were used in genetics and aging studies. A group of rats of the Rattus norvegicus species were sent, with an average weight of 215 g (7.6 oz) at launch and 62 days of age. Twenty of the rats experienced microgravity and the other ten were subjected to the artificial gravity of the centrifuge.

See also


  1. ^ a b c d e "Display: BION-4 1977-074A". NASA. 14 May 2020. Retrieved 3 January 2021. This article incorporates text from this source, which is in the public domain.
  2. ^ Archived 2002-08-20 at the Wayback Machine Encyclopedia Astronautica Retrieved 28 May 2016
  3. ^ "Cosmos 936". NASA Ames. 3 August 1977. Archived from the original on 15 February 2013. Retrieved 12 March 2014. This article incorporates text from this source, which is in the public domain.


  • Kozlov, D I (1996), Mashnostroenie, ed., Konstruirovanie avtomaticheskikh kosmicheskikh apparatov, Moscow, ISBN
  • Melnik, T G (1997), Nauka, ed., Voenno-Kosmicheskiy Sili, Moscow, ISBN
  • "Bion' nuzhen lyudyam", Novosti Kosmonavtiki, (6): 35 1996
This page was last edited on 3 January 2021, at 11:46
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