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This was the response. Is it correct?

If the gravitational law varied with space, linear momentum could not be conserved. If it varied with time, energy could not be conserved. Since both momentum and energy are indeed conserved, the fact that gravity does not vary with space or time is not surprising in the least. Noether's First Theorem.

The form of the gravitational law is restricted to be invariant by the time- and space-translation symmetries of the universe, which result in the observation that all physical action conserves linear momentum and energy. Gravity simply could not be at times strong and other times weaker in the universe we live in.