Kids climate strike, what really happened, page-148

"A scientific theory is a hypothesis that has been shown to be true by the scientific method, it is not something made up but something that has been tested and shown to be true. Ie the theory of gravity. "

That's why the Law of Gravity is called exactly that, as opposed to the Theory of Gravity.

The existence of gravity was indeed a theory and one stage, and then after it was proven and it became more than a mere hypothesis, it became accepted as a law of physics.