Leonov, Aleksei Arkhipovich (ŭlˌyĭksyāˈ ärkhˌyĭpôˈvyĭch) [key], 1934–, Soviet cosmonaut. While serving as copilot of Voskhod 2 (Mar. 18–19, 1964), he became the first person to perform extravehicular activity. Leonov was also command pilot for Soyuz 19 in the Apollo-Soyuz Test Project (July 15–21, 1975).
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