DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
First space walk. Illustration commemorating Soviet cosmonaut Alexei Leonov (born 1934), outside the Voskhod 2 spacecraft in a spacesuit on 18th March 1965, while orbiting the Earth (in the background). This was the world's first extravehicular activity (EVA), or space walk. Voskhod 2 had launched earlier that day, and Leonov exited the spacecraft at 08:30 UTC. He remained outside for 10 minutes, before trying to re-enter. Because his suit had ballooned while outside, he had to let some of his air out before he could successfully re-enter.
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