This video delves into the physics behind black holes, the theories surrounding them, and the speculative possibilities they entail, while also touching upon the limitations and challenges in reconciling these theories with known physics. According to our current best understanding, it seems likely that white holes, traversable wormholes, and parallel universes don't exist, but we also used to think that black holes didn't exist.

So maybe we'll be surprised again. I mean, we have one universe, right? Why can't we have two?

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