The universal law of gravitation
In 1687, Isaac Newton's treatise Philosophiæ Naturalis Principia Mathematica showed that every object in the universe, small and great, pulled on every other object, from a grain of sand to the planets.
Newton could compute the attraction: Doubling the mass of one object makes its pull twice as strong, and bringing two objects twice as close quadruples their mutual pull.
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Gravity is one of the universe's fundamental forces
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