Any of a series of six manned Soviet spacecraft launched from 1961 to 1963. Vostok 1 (1961) carried the first human (Yury A. Gagarin) into space. Vostok 3 set a new time record in space of 94 hours. Vostoks 5 and 6 were launched two days apart and traveled very close together, at times only 3 mi (5 km) apart, setting the stage for future dockings between orbiting vehicles. The first woman in space, Valentina Tereshkova, flew aboard Vostok 6.

This entry comes from Encyclopædia Britannica Concise.
For the full entry on Vostok, visit Britannica.com.

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