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To cosmic shreds, I say!
(thelemmy.club)
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this post was submitted on 18 Jun 2026
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This is the baryon asymmetry problem, and indeed, one of the proposed solutions is an "anti-universe" that flows backwards in time. The theory goes that all the antimatter travelled backwards in time while matter travelled forward from the Big Bang, creating a mirror anti-universe. However, there has been experimental evidence against this theory, as antiparticles seem to move forward in time, just like their matter counterparts.
There are a bunch more theories on how matter dominated the universe, like electroweak baryogenesis and leptopgenesis! Those are a bit more complicated though and are difficult to explain in an internet comment.