How did the universe happen? well, we can assume that at the beginning of the universe, there was one of two things.
A) Matter
B) Void
If the entire universe, at this point is one of these two options, we must assume that there is also the other element; If one had void without matter, matter would be created, to reconfirm the non-existence of void, for if all was nothing, nothing could not be identified as nothing, but as everything, thus denying it's very existence. If the entire universe where matter, It would mean that infinity was filled; however, one can never fill infinity; thus, no mater how fast matter expanded, void would be created.
And so we see that the universe must BE.
