"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."
"Centripetal force is the force by which bodies are drawn from all sides, are impelled, or in any way tend, toward some point as to a center."
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Source: Sir Isaac Newton (2016). “The Principia: The Authoritative Translation: Mathematical Principles of Natural Philosophy”, p.51, Univ of California Press
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