Wow!! I am sure you do not have any contact with scientists that work in this field. By no means they consider any Big Bang theory as a fact. One must not confuse the actual collected data with the inferences made while interpreting them. They know they are making unverified (although reasonable) premises and adjusting lots of contradictory data so as to fit in the theories, by using ad-hoc hypothesis (this is very common in Science). Even the event called "Big Bang" can't be considered as a fact because this is the result of a conclusion based on data interpretation (which is subject to premises, inferences, etc.), not a direct observation (of course) (an example of a more direct observation that IS a fact is the red-shift of light) — EPLeite .