Comment by CobrastanJorji

"Proving anything" is kind of fuzzy. We've got very solid evidence that some sort of big bang happened. We can see the galaxies flying away from a common point, and since we can count backwards, we can know roughly when they probably would've been in the same spot. The how and why, and the what happened before, those are very unknown, although we've got a surprising amount of knowledge of what the first few seconds were probably like.