Sigh! For the nth time, at least for the sake of any other readers, science does NOT deal in "proof". Karl Popper was very clear about this. You can accumulate evidence for a theory in science, which may in time become pretty overwhelming, but you can never prove it. Scientific theories are (usually imperfect) models of the physical world, not mathematical theorems. People who demand "proof" of scientific theories are almost always anti-science and usually have an axe to grind: creationists, climate change deniers, believers in little green men, or crop circles, that sort of thing. Generally fools or knaves, to a man.