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Gravity's role is to keep the planets in orbit and balance.
The sun is the center point of the solar system. Earth moves around it. The sun is a great force of gravity (and is where the gravity on earth originates) keeping everything surrounding it in constant orbit around it.he   Earth moves around the Sun, it takes 365 days (one year) to go all  the way   aro â¦ und. As the Earth moves around the sun it is spinning.