According to a common myth, Newton's theory of gravity was born the moment he was struck on the head by an apple that had fallen from a tree. Actually, Newton was contemplating about the enigmatic force that causes objects to fall to the earth when he witnessed an apple drop from a tree. He contrasted the cannonball's curved trajectory with the apple's straight course. When he discovered the cannonball would ultimately "fall" around the curvature of the Earth for all eternity without ever touching the earth, he pondered what would happen if it continued to go faster and faster. Both the Earth's rotation around the Sun and the Moon's orbit around the Earth are described by this "forever falling" motion.
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