On March 18, 1965, cosmonaut Aleksei Leanov left his spacecraft during an orbit around the earth and became the first person to walk in space. In 1969, Neil Armstrong took the first human step on the moon. And in 1984, Bruce McCandless became the first "human satellite," using a Manned Maneuvering Unit to walk in space without being fettered to a spacecraft. All three men participated in what is called "extravehicular activity" (EVA), any action in space that occurs outside of a spacecraft. EVA is the subject of a new exhibition at the Smithsonian National Air and Space Museum, Outside the Spacecraft. For those unable to visit the museum in person, this sleek website lets readers learn more about the equipment design that enables EVA, watch the original 1965 footage of Leanov's first extravehicular foray into space (a feat which, as the caption explains, was nearly fatal), and take a peek at artwork inspired by EVA.