What inspired Newton's theory of gravity?

What inspired Newton's theory of gravity?

Newton was inspired by observing an apple fall from a tree, leading him to ponder why objects fall.

Is it true that he formulated his theory while sitting under an apple tree?

Yes, that's a popular story, though it's likely a simplification of his thought process.

What are the key principles of his theory of gravity?

Newton's theory states that every mass attracts every other mass, and the force depends on their masses and distance.

How did this theory change our understanding of the universe?

It revolutionized physics by providing a mathematical framework for understanding motion and celestial bodies.

Are there any modern theories that challenge Newton's ideas?

Yes, Einstein's theory of relativity provides a more comprehensive understanding of gravity, especially at high speeds.