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27. Natural Reality / D. Cosmology / 4. Unique Cosmos

[whether there may be other universes]

3 ideas
It seems possible that there exists a limited number of other worlds apart from this one [Aristotle]
There are endless cosmoi, some like and some unlike this one [Epicurus]
A cosmos is a collection of stars and an earth, with some sort of boundary, movement and shape [Epicurus]