Explain Newton's law of universal gravitation.
The law of universal gravitation posits that every particle of matter in the universe attracts every other particle with a force. This force is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. It is a universal law, meaning it applies to all bodies, irrespective of their size or composition, and it is the unseen hand that governs the celestial dance of the planets and the moon's pull on our tides.
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