The fall of an apple, the question on the mind of Newton, the force of the world that makes apples fall is the same force that "pulls" the moon it does not go anywhere else, and the orbit around the Earth. Oval Calculation results confirm this idea, but it is not clear until the written correspondence between Newton and Robert Hooke that caused Newtonian mechanics confidence and assertion about the movement has matured. That same year, Edmund Halley visited Newton to discuss the question of the planet. Hal Valley amazed at Newton said force between the sun and the planets that orbit the ellipse, it is subject to a quadratic Newton has already proven itself.
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