astronauts train alot so they won't mess up or do some thing unexpected or fall off the planet that they are on
ASTRONAUTS=is person that train walking in the space
they go in water and fix things
They mostly train in Swimming Pools, thousands of feet underwater.
it depends on what they train to do
I think its Houston
They have to train to get used to weightlessness , and get over travel sickness as well, and the instruments as well.
To train astronauts or other unknown reasons.
To be prepared because everything is different in space.
A lot of people
It would be hard but astronauts would of been trained to do that so they can
It is important cause they will vomit
Using the Vomit Comet to experience moments of temporary weightlessness.