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2. Gravity, Mass and Distance

The amount of gravity any object has is proportional to the mass of the object. Objects with more mass have more gravity. As the Earth is the largest and closest object around, everything is caught in its gravitational pull, which means apples fall on the ground instead of being drawn towards a person's head.

Distance also affects gravity. If an object is far away, it's gravitational pull is weaker. For example, there's a point in space where the pull of Mars becomes stronger than the pull of Earth.

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