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Gravity's role is to keep the planets in orbit and balance.
Uranus' gravity is 89% of the force of Earth'sThe surface gravity is 8.69m/sec2 while Earth's surface gravity is 9.78 m/sec2. 86% of gravity is on uranus because it is mostly â¦a gas The gravity of Uranus is 8.69 meters per second squared. Its  gravity is 89% the force of gravity of Earth.