I see I made an error asking my question. Sorry for the confusion. If our observable universe lies within an unobservable universe, and the unobservable universe is truly infinite, then is it possible other universes which began with Big Bangs as it is thought ours did also exist somewhere in the unobservable universe?
I see I am having problems with using the correct terms. Let's see...if the unobservable universe could be called the Grand Universe, and our own observable universe could be called a Pocket Universe which lies within the Grand Universe, could there be other Pocket Universes within the Grand Universe?