A universe is a region where a consciousness can have a characteristic experience. Some can persist without being 'occupied' by a consciousness. Most are finite, a few are infinite at least from an inside point of view. Despite some universes being infinite in 'size', one can always withdraw 'outside' of them. The nature, character, consistency, richness, and scope of universes vary greatly.
By suggesting 'physical' you are probably referring to universes manifest into form. These are always finite as per the nature of 'form'.
I consider the Astral planes collectively as a separate universe from material space-time. The Astral and material are very 'near' to each other as the difficulty of crossing the gap between them is nearly trivial (for humans). Note that many 'lower' life forms can not make the crossing.
I refer to the set of all universes simply as the 'ALL'. This includes the 'area' not in any universe. It has no separation, dimension, or size; rendering the finite/infinite question moot.
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As totally other way to look at this: 'God', the only, is not contained by the universe concept. But for our limited consciousness, we can think of universes as reflections in mirrors. Each mirror reflects a part of God. Some mirrors are bigger, some smaller. There is no limit to the number of mirrors or reflections of God. One can always add a new mirror. Similarly, no mirrors are required for God. Some morrors are on 'opposite sides' and reflect into each other giving the impression of infinity. Though the apparent size of the image (universe) in the mirror varies, none actually affects the size of what it reflects.
Sin nada (Nothing is impossible)
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