Newton extended the idea by arguing that the same force causing an apple to fall to Earth and the Moon to orbit Earth also governs the motion of planets around the Sun.
How did Newton extend the idea of gravitational force to explain planetary motion?
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Newton extended the idea of gravitational force by formulating his law of universal gravitation, stating that every mass exerts an attractive force on every other mass. He applied this to explain planetary orbits, showing that gravity governs their elliptical paths around the Sun.