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There is no known anti-gravity technology. Earth's gravity is strong enough to pull objects, such as the moon, towards itself. This means that everything that humans do, including fly, is greatly affected by this force. This is why weight, which is caused by gravity, is one of the four forces of flight in our atmosphere! Though there is no anti-gravity technology, NASA uses facilities that can mimic microgravity conditions. For example, conducting trainings in large water tanks where everything is neutrally buoyant makes astronauts feel like they are floating. But, this is not truly anti-gravity or micro-gravity.