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Gravity is not generated.

There are two main explanations of gravity, either general relativity, or an explanation which uses quantum mechanics.

According to general relativity, gravity alteres spacetime. This causes a spacetime curvature, which is responsible for the fact that masses atracct one another.

According to the other theory, it is the result of the exchanges of virtual gravitons.

Since gravitons have not been observed yet, most physicists accept general relativity as the explanation. Other theories exist, but not enough evidence has been gathered so far.

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