Maybe it never began? Maybe it just has always been? I think the human mind can conceive of eternity as it applies to the future, but not as it applies to the past.
That theory is about 50 years behind the times. The big bang (creation) really occurred around 15.7 billion years ago (from our perspective).
Of course, cuz if the universes existence keeps going back
into the infinite past, we would not have arrived at this
present time. Therefore, because we ARE here(aren’t we?),
the universe must have had a beginning,at a time slightly
after it did not exist.