I think, in a sense, nothing in science can ever be proven true. We can only say that such and such seems to represent reality sufficiently well to enable us to predict what will happen in any given set of circumstances. The essence of the scientific method is to make a wild ass guess (WAG) and devise ways of proving it wrong by using it to make predictions. If the predictions prove wrong either scrap the WAG and start over or fine tune the WAG and make more predictions. Eventually the WAG becomes fine tuned enough that it rates the term SWAG. When it keeps working despite all the testing thrown at it it becomes a Theory.

Theory, like mist on eyeglass, obscure vision
    - Falcon of Fong, quoting Freddie Fong