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For another truly distinct universe to exist, it would have to be wholly separate from this universe. If we knew about the existence of another such "universe," it would not be wholly distinct from our universe.

Therefore, we cannot, in principle, know if other universes exists.

For another truly distinct universe to exist, it would have to be wholly separate from this universe

Science would once again force us to rethink our understanding of what a universe is. Somehow religionists believe that God can exist external to space-time but be active in space-time. Intellectually, how is that different?

For another truly distinct universe to exist, it would have to be wholly separate from this universe. If we knew about the existence of another such "universe," it would not be wholly distinct from our universe. Therefore, we cannot, in principle, know if other universes exists.

That may seem intuitively true, but it's not true in several theories currently being studied and developed.

There was a time when what we now call our galaxy was considered to be the universe. Then we found that there are multiple galaxies.

The same fate may befall the notion that the big bang describes the creation event for all matter that exists.

Several theories allow for the detection of other universes.