How Astronauts are trained for 0 gravity?

Answer:
They go underwater in a giant pool of water, it is the closest to 0 gravity on earth. Occasionally, they go into a plane called 'Vomit Comet'. The plane goes high up in the atmosphere and descends rapidly over a period of 30 seconds. The plane's descending speed hits the astronauts terminal velocity, hence the astronauts can simulate what it feels like to be weightless.
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