In 1965, NASA astronaut Ed White conducted the first American spacewalk during Gemini 4, demonstrating that astronauts could maneuver and work in open space, a milestone that enabled future missions involving spacecraft repair, station assembly, and long-duration human presence in orbit. Follow @spaceeves #spacenews #nasa #spacehistory #gemini | SpaceEve

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NASA Astronauts train for spacewalks in America’s largest pool, the Neutral Buoyancy Lab. To simulate microgravity, they practice underwater using a full-scale replica of the space station. Astronaut Anne McClain describes a spacewalk as “hanging off a cliff and performing brain surgery at the same time.” Credit: Smithsonian | National Astronaut Day