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The strength of gravity is directly proportional to the amount of mass of each object. The gravitational force increases as the size of an object increases. On the other hand, the strength of gravity is inversely related to the square of the distance between two objects.
Clearly has a relationship to mass. It also has a relationship to time, gravitational time dilation. We can't really define time, either, though we label it the 4th dimension. If gravity affects mass and space, effectively the third dimension, and time, effectively our way to perceive the 4th dimension, then it is clearly at least represented in 2 dimensions.
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