'Multiverse Fermi Paradox:' Where Are the Civilizations ...
https://www.learning-mind.com/multiverse-fermi-paradox-where-are-the-civilizations-from-other-universes/
The Multiverse. The universe itself is the breeding ground of various theories, including the idea of multiverses. The multiverse can be structured in more than one way. For instance, these universes could be the cause of cosmic inflation or ‘tiny universes’, or they could be whole other words in the higher dimensional M-theory.
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