Newton's laws of motion and his law of universal gravitation provided a framework that supported and expanded upon Kepler's laws of planetary motion. Kepler's first two laws describe the elliptical orbits of planets and the relationship between their orbital period and distance from the sun. Newton's law of gravitation explains why planets move in these orbits, attributing the force that governs their motion to the gravitational pull of the sun. Thus, Newton's work confirmed and explained the underlying principles behind Kepler's observations.
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