The principle used to simulate weightlessness in a huge tank of water is called 'neutral buoyancy'. A neutrally buoyant object neither floats nor sinks. For an astronaut to be neutrally buoyant in the …

Aug 30, 2020 · Since the astronauts are travelling at the same speed as the ISS, staying close is pretty easy. It's not like they get blown away by a blast of wind when they step outside like you would if you …

Nov 24, 2025 · Astronauts train for hours underwater to prepare for spacewalks, using NASA's Neutral Buoyancy Laboratory to simulate microgravity. Learn how EVA training works, why it's so intense, …

Jan 8, 2026 · A deep dive into how astronauts prepare for spacewalks and EVA readiness, from neutral buoyancy training to human factors, robotics, and emergency procedures.

So when something needs to be repaired, removed or added and robotics just won't do the trick, specially trained astronauts have to conduct spacewalks to take care of the problem with human …

Jul 27, 2020 · When astronauts are inside the spacecraft, the airlock is airtight so no air can get out. When astronauts get ready to go on a spacewalk, they go through the first door and lock it tight …

May 8, 2024 · Formally known as the Manned Maneuvering Unit, the invention was a massive backpack equipped with gas thrusters that would allow astronauts to leave their spacecraft and float free in …

Aug 6, 2010 · This system uses small jetthrusters that astronauts can control with a joystick to maneuver around inspace and make their way back toward a spacecraft if necessary.

Why would a spacewalking astronaut float off if not tethered to the craft? Newton's first law of physics means that an astronaut without a line tying him to his ship will drift in the same direction forever.

Extravehicular activity (EVA) is any activity done by an astronaut in outer space outside a spacecraft. In the absence of a breathable Earthlike atmosphere, the astronaut is completely reliant on a space suit …