Through reading many threads in this forum and many books I understand that a good theory makes many predictions that come true during experiments. And the more predictions a theory makes that experiments agree with the more sound that theory becomes. Yet one contradictory experiment of a theory can disprove it altogether. My question is, will famous theories we talk about ever become factual? Is it a theory that the moon orbits the earth and the earth orbits the sun or is that a fact? If the moon orbiting the Earth is a fact, then what would have to happen in order for the Theory of Relativity to become a fact?