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Gravity's role is to keep the planets in orbit and balance.
Gravity, combined with the velocities of the planets, keeps the planets in orbit around the Sun. Gravity between any body, such as a planet, and the Sun is one factor. Also thâ¦e planet has a velocity. These two things combine to keep the planet in orbit around the Sun. Gravitation. The suns gravitational pull. The huge mass of the sun means it has a huge gravitational pull, keeping all of the planets in place.