@kfmarani The fact that we can see back to the wall of interference when the cosmic background radiation cooled enough to stop reflecting all light means that the part of the Universe we live in, the part created by our Big Bang, must be finite and 13.72 billion years old. We can only see back to 100,000 years after T=0 because before that, the temperatures were too high to permit light to pass through the cosmic background radiation.
But the mind boggling thing is that not only could there be other universes from other Big Bangs, but we could possibly create one here and while within it it would appear to constantly expand, from our viewpoint it would appear to collapse into a black hole.