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Gravity's role is to keep the planets in orbit and balance.
Gravity is a force that causes planets to form the shape of a sphere by pulling the mass of the planet close to the center of gravity. In the case of the Earth, gravity pulls the planet as close to the core as possible. The sphere-like shape of the Earth is distorted slightly by the centrifugal force of its rotation. This force causes the mass of the planet to move away from the center of gravity, which is located at the equator.