Can we prove the unknown?

A myth is an idea, widely accepted by a group of people, to answer a certain question. But just because it's the collective opinion, doesn't suggest that it's true. So, is it possible to prove belief? What I may believe, is different from what you believe. Perhaps myths could be proven with enough information and data, but that's not to say that you can convince everyone that it's true. It is extremely difficult, if not impossible, for everyone to agree on everything. Myth is a matter of opinion and beliefs, nothing more.