Newton's law of universal gravitation

Classical statement of gravity as force

Newton's law of universal gravitation describes gravity as a force: any particle attracts any other particle with a force proportional to the product of their masses and inversely proportional to the square of the distance between their centers of mass. Separated, spherically symmetrical objects attract and are attracted as if all their mass were concentrated at their centers. The publication of the law has become known as the "first great unification", as it marked the unification of the previously described phenomena of gravity on Earth with known astronomical behaviors.

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