Newton reasoned that if the Earth can attract an apple and the moon, then all objects in the universe must attract each other, leading to the concept of gravitational force between all objects.
How did Newton extend his understanding of gravitational force beyond Earth and the moon?
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Newton extended his understanding of gravitational force by proposing the law of universal gravitation. This law states that every mass attracts every other mass in the universe with a force proportional to their masses and inversely proportional to the square of the distance between them, applying universally to all celestial bodies.