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Newton's theory of gravity proposed that a single force could account for both the behavior of objects near the ground and the motions of the planets. These had previously been thought of as disparate phenomena. As Newton put it:


“I deduced that the forces which keep the planets in their orbs must  [be] reciprocally as the squares of their distances from the centers  about which they revolve: and thereby compared the force requisite to  keep the Moon in her Orb with the force of gravity at the surface of the  Earth; and found them answer pretty nearly.”[SUP]http://en.wikipedia.org/wiki/Gravitation#cite_note-2[/SUP]


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