Using our current understanding of the universe time travel is impossible, BUT that might turn out not to be true, as our understanding becomes better and technology improves we can perform better experimetns that might prove it to be possible?
The multiverse is much harder to prove or disprove and so far theres no way to tell, I would love to think it does exist, if we think the universe is infinite then by definition everything HAS to be possible???
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SectumSarzzies commented on :
Well no I’ve never seen Flash, I was watching a theory on a movie on YouTube and it said something like this