Newton observed that all planets orbit around the Sun, suggesting the presence of a force between them, similar to the force between the Earth and the moon.
What led Newton to conclude that there exists a force between the Sun and the planets?
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Newton observed the motion of planets, noting their elliptical orbits around the Sun. He reasoned that an attractive force from the Sun, acting at a distance, was responsible for keeping the planets in their orbits, leading to his law of universal gravitation.