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Re:Experiments Spell Doom for Decades-Old Explanation of Qua... by jameshart on Friday October 21, 2022 @02:55PM (#33291734)
Sci-fi plot concept answer: because one galaxy is populated by sentient life, and the other isn’t.
Re:Experiments Spell Doom for Decades-Old Explanation of Qua... by tremon on Friday October 21, 2022 @04:22PM (#33292619)
Quarantine by Greg Egan explores this concept (the many-worlds theory, without the dark matter).