Because if weighted properly, they can be neutrally boyant. In other words, they're as close to weightless as they can get on earth. The astronauts train underwater to give them a sense of what its like to do their task while weightless and also to practice the peocedures required for their task. The first astronaut to take advantage was Buzz Aldrin when he trained for his Gemini 12 mission. Aldrin was and is still an avid Scuba diver. He noticed the similarity between water and space. His succees on Gemin 12 made underwater training the norm for all astronaut extravehicular training.
The buoyancy of water is using to simulate zero gravity, because the arms and legs have very little effective weight underwater, but still have mass. The difference between underwater and zero G is that water still resists motion. In a true weightless condition (in an air-filled spacecraft or the vacuum of space), there is almost no resistance.
Underwater, the heavy spacesuits with air inside can weigh almost nothing. So by varying the buoyancy, they can simulate either zero-G or a gravity less than on Earth. In a simpler way of putting it: They train in a 600 gallon tank of water in real space suits, to achieve the feeling of weightlessness.
Because they need to practice the "space walk" some how.
Having neutral buoyancy underwater simulates the weightlessness the astronauts will experience in space.
Working underwater could help astronauts being in space because it's weightless almost like in space.
They use centrifical force machines to duplicate high G-forces. They train underwater to simulate weightlessness.
yes
Neil Armstrong (R.I.P.) is probably the most famous of America's astronauts, as he is credited with being the first human being in history to walk on the surface of the Earth's Moon.
just do the work. stop being lazy
Funding, mostly with the whole economic crisis and that, it is hard to convince people that we need to spend billions to get us to Mars. That and being stuck in a small, metal tube with the same people for five years compounded by the constant threat of death has had the tendency to drive said potential astronauts mad.
Having neutral buoyancy underwater simulates the weightlessness the astronauts will experience in space.
They use centrifical force machines to duplicate high G-forces. They train underwater to simulate weightlessness.
they stay as astronauts for 6 or more months
yes
Well, some astronauts do. Not all astronauts will die in space, but some will if the mission went wrong or if it is just being there when you die of natural causes.
There are many items underwater that are found in many places.
Being underwater does not feel the same as being wet when exposed to the air, because when you are underwater the water on your skin is not evaporating, and doesn't make you feel cold. Nonetheless, a person underwater is wet, even though he or she won't really feel wet.
The Etrex Garmin is water resistant, as it can take a splash or occasional dunk in the water and keep on working. Though it is not waterproof to the point of being able to work underwater.
by being cold blooded by having second eyelids and by being able to breath underwater
Holding your breath underwater is when your head/face is underwater and you do not breath.
Atlantis
yes you can