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Gravity's role is to keep the planets in orbit and balance.
Yes but only just. Gravity is a relationship between the mass of a planet and the distance from the centre. In simplistic terms G = M /R Where G = gravity, M = mass and R = radius. It's a bit more complicated than that-but is a good approximation. For example Saturn is about 9 times larger than the Earth but the gravity is only just above that of the Earth.