You’re certainly entitled to your opinion, but like I said, I don’t want an argument, I want a correct answer to my question.
In listening to more of Fr. Spitzers video, he mentioned it again so I assume it’s not against the Catholic faith.
I do not believe the Catholic Church has made a definitive judgement on the matter of multi universes and may never will for it certainly is not beyond the power of God. At the same time, I do not think the theory is likely for the following reasons.
Firstly, the CCC#290 and CCC#326 says that the meaning of “In the beginning, when God created the heavens and the earth” (Genesis 1:1) this includes the totality of all that exists outside of God whether it be the material creation or the angels, of all that is seen or unseen. Now Holy Scripture always uses the words "world’ or “universe” in the singular. Indeed, in the beginning of St John’s gospel, it is written concerning the Word of God:
All things came to be through him,
and without him nothing came to be…
He was in the world,
and the world came to be through him…(John 1: 3,10) as if one world or universe exists.
Again, we recite as an article of faith in the Nicene-Constantinopolitan and the Apostles creeds, “I believe in God, the Father almightly, creator of heaven and earth” as if one world or universe exists.
Secondly, Holy Scripture and the CCC#358 teach that human beings are at the pinnacle of God’s material creation. Human beings are the only material creature that God created for themselves, all other material creatures were created for human beings and to serve human beings; and this principally in two ways: first, as sustenance to his/her bodily life; second, as helping him/her to know God, in as much man sees the invisible things of God by the things that are made (Romans 1:20).
Now, another universe besides the one we live in is not necessary for the sustenance of man’s bodily life. Indeed, only one star, our sun does this. Nor would another universe besides the one we live in be necessary for man to see the invisible things of God by the things that are made for two reasons: first, we do not see this other universe or universes; two, even if it did exist, we have no knowledge that it does exist.
Thirdly, God created human beings for Himself. Our perfect happiness and last end does not consist in any created thing but only in God as St Augustine said " our hearts are restless til they rest in Thee." So, if this vast universe we live in cannot satisfy the heart of man, neither would another universe or, indeed, an infinite number of them.
Fourthly, though I do not know all the reasons why some people propound this theory of multi universes, I suspect that at least some if not all of them can hardly be reconciled with the science of true metaphysics.
It may be more likely that in the future, as long as the world is still turning, instead of discovering other universes that may or may not exist, mankind will discover that the universe we live in is more vast than presently thought. Maybe we will discover stars or galaxies that are 30, 60, or 100 billion light years away.