@untelligence That is an excellent question!
Physicists disagree over whether multiple universes really even make sense. Some say it's a crutch -- the idea that there are an infinite number of universes, each with different sets of physical laws and constants, was basically invented to make people feel better about the odds, rather than account for actual physical necessity.
The bottom line is, we really don't know.
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@untelligence But for us, at least, we have to deal with the fact that within the reality of our own universe, it seems nothing can travel faster than light.