Newton observed that the motion of the moon around the Earth resembled the motion of objects falling towards the Earth’s surface, prompting him to consider whether the Earth’s gravitational force also affects the moon.
What observation led Newton to speculate about the force between the Earth and the moon?
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Newton observed the moon’s motion around Earth and realized that it followed an elliptical orbit. He speculated that a gravitational force between Earth and the moon was responsible for maintaining this orbit.