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A planet's gravity is cause by it's mass (how big it is and it's density). The bigger it is the stronger it's gravitationally pull is. Imagine this: that all the planets are marbles (with the size of the marble equal to how big the actual planet is) and imagine that all the marbles are on a stretchy cloth suspended in air on earth, the bigger marbles should make the cloth go down in that area and causes the other marbles to come to it.

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14y ago

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