Well, if they accepted the Big Bang Theory as a fact, it wouldn’t be a Theory.
AS no one saw it happen, then the best we can say is that it “probably happened this way”.
As it stands, all we do know is that the local universe went from smaller to bigger. We can take good guesses as to what happened when it was really small, but, there comes a point where it’s all a good guess.
Yep..its a good guess.
Which I am okay with that.
Anyhow, have read other theories..including it wasn’t a “bang” at all.