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... ortional to the square of the distance between them.
The law of universal gravitation was first proposed by Newton in the book Principles of Natural Philosophy published in 1687. Newton's use of the law of universal gravitation not only illustrates the laws of planetary motion, but also points out that the satellites of Jupiter and Saturn also have the same laws of motion around the planets. He believes that in addition to the gravitational pull of the Earth, the Moon is also subjected to ...
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