How do astronauts learn how to deal with weightlessness?
[Edit] I’m editing this whole thing, and hopefully people read it, because many of them are confused on the purposes of these machines. Weightlessness they train for in the Vomit Comet. It flies up really high, and then nose-dives for a minute or two. While it is falling, you are in freefall, but with no wind resistance. This is exactly what it feels like to be in space, because when you orbit the earth, you are in freefall indefinitely, but your velocity and the force of gravity cancel, and prevent you from entering the atmosphere. Here they practice doing things they’d need to do in a shuttle. You can also pay to get on one of these yourself, but I think the cost is pretty steep. The centrifuge is a spinning machine. You sit in a chair and they spin you around really really fast so you stick to the outside wall due to centripetal force. This is not for weightlessness, in fact it produces the exact opposite effect, and you are experiencing many times the normal force of gravity. This
