Sun's gravity hold all planets on their orbits
like Earth's gravity holds us on the Earth's surface
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Because of gravity. Simple
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The planets are held orbit around the earth because of gravitational force.
Newton's realized that the reason of the planet orbit the sun is related to why objects fall to earth when we drop them.the sun's gravity pulls on the planet,just as Earth gravity pulls on the planet,just as Earth gravity pulls down anything that is not held up by some other Force and keeps you and on the ground
hope it helps