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If they're separate *universes*, does it matter? That sort of implies we could never interact with them, or explode if we do. Blackhole travel is a nice idea, but same. An infinite infinities of possibilities can of course exist, the same as we could be one of an infinite series of universes. I don't know, maybe it's pleasant to think there will be something even when we're gone, in the most literal of senses. But I think we will only see them in our dreams.