Extravehicular activity or EVA refers to any activity done by an astronaut outside of a spacecraft and outside of the Earth’s atmosphere.This can refer to moonwalks and spacewalks. The first spacewalk was carried out in 1965 by Russian cosmonaut Alexey Leonov who spent 12 minutes outside of his Voskhod 2 spacecraft. The first untethered spacewalk was made by Bruce McCandless in 1984 during a Challenger mission. He used a propulsion unit strapped to his back to manoeuvre himself.