That will, in part, depend on what you mean by “alternate universes”…
Everett’s Many Worlds Theory where all possible quantum events can take place when there is a choice has been interpreted to mean that the Universe is continually splitting into alternative paths
Some people think this is real and there is a Universe, for example, where Lucy did not ask that question or asks it in a different way.
There is the idea of a multiverse which can be understood as there being more than one universe, but these do not talk to each other.
I feel that the discussion around this is probably taking the physics and maths too far but who knows!
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