Answer:
proven to be true
Step-by-step explanation:
facts go through testing to be proven that they are correct, while opinions can be personal thoughts about a subject like an opinion is "Dominos has the best pizza" that statment has no backing and many may disagree. it is a personal though or opinion.
A fact on the other is something that has been proven to be correct like all things are made up of atoms. There has been testing to prove and disprove this, however is has come out of testing proving to make that statment a fact as there is no disputing it.