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How are zero gravity simulations done?

One way is NASA has a special jet (affectionately known as the "barf wagon") that simulates zero G by free falling in a parabolic arc. That can produce zero G for about 30 seconds to a minute.

John Hawley

The other way is in a "neutral-bouyancy" tank of water, where the weight of the astronaut plus gear is just right to float in the middle of the water, so it almost feels like being in zero gravity. Except that water's pretty different from a vacuum.

Arthur Smith

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