Why is gravity an example of scientific theory?

Sir Isaac Newton made up the law of gravity. This involved using the scientific theory.

- - The theory of gravity gives a good explanation for things

that we see happening.

- - The theory of gravity predicts things that turn out to be true

when we test them.

- - Nobody has come up with a different theory that explains things better

and makes more accurate predictions that the theory of gravity does.

- - The theory of gravity can't be proved.