[5] Launched 18 December 1973, the Soyuz 13 crew of Klimuk and Lebedev performed some of the experiments intended for the failed Salyut space stations from the previous year.

[5] They also tested the Oasis 2 closed ecology system, and harvested protein, yielding 30 times the original biomass.

[5] The crew landed in a heavy snowstorm on 26 December 1973, but were recovered a few minutes later, some 200 km at southwest of Karaganda, Kazakhstan.

[6] The Orion 2 Space Observatory, designed by Grigor Gurzadyan, was operated by crew member Lebedev.

The first satellite Ultraviolet spectrogram of a planetary nebula (IC 2149 in Auriga) was obtained, revealing lines of aluminium and titanium - elements not previously observed in objects of that type.