If something logically exists (or logically does not exist) in one possible

If something logically exists (or logically does not exist) in one possible

If something logically exists (or logically does not exist) in one possible world, why is it necessary for that same something to logically exist (or logically not exist) in all possible worlds? I do not have any background in modal logic and I am trying to understand the argument for the nonexistence of time as described in Yourgrau's recent book on Gödel and Einstein.

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