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"Because gravity also spreads outside spacetime, only a fraction of its strength is available inside spacetime, and this is given as the explanation of why gravitation is so much weaker than the other forces."

If this statement is true, is it still possible that there are infinite amount of dimension? If there are infinity of dimension, then the gravity force will certainly be zero, as gravity must spreads into every dimension.

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# Is it possible to have infinite amount of dimension?

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