Spacewalks are the hardest thing, physically and mentally, that astronauts do. Pictured here, our 2017 NASA Astronauts train in the Neutral Buoyancy Laboratory (giant pool used to simulate weightlessness) to learn the skills to complete complex spacewalks. Make sure to follow our friends at nasajohnson, home to astronaut training, mission control, and many other NASA programs that are vital to exploration of space. Credit: NASA #newastronauts #nasa #space #spacewalk #nbl #exploration #neutralbuoyancylab #spacecity #houston