The Theory of Gravity Is Hard to Variate

What makes a theory a good explanation is it's hard to vary. Newtonian gravity is the universal law of gravitation. Once you say that it applies here on earth, it's the law of gravity. Gravity exists anywhere there's mass. It suddenly applies throughout the entire universe reach reach. Any claim that's universal has potentially infinite reach out to the far reaches of the universe. The better an explanation is the more rigidly it's reaches determined because the harder it is to vary an explanation.