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Gravity

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Gravity is a force of attraction between any matter and all other matter in the universe. It is the weakest of the four fundamental forces, but its influence falls off with distance far slower than the other three. As a result, gravity's effect can be seen in the grouping of stars into galaxies a hundred thousand light-years across, and the grouping of the galaxies themselves into super-clusters tens of millions of light-years across. The gravity near the surface of the Earth will accelerate a falling object at approximately 32 feet per second every second (or around 10 meters per second every second).

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