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

What happened This Week @NASA? Spacewalks, Earth Science mission updates, Commercial Crew groundbreaking & more Watch: http://youtu.be/zczwVH4jcDQ | NASA - National Aeronautics and Space Administration

197K views · 2.8K reactions | 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 | Facebook