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Anyway, as I see it, the most direct way to qualify something as being, in fact, a separate spacetime continuum is to have it be explicitly referred to as such, if we are to go down the route of "Separate universes are not inherently timelines unless otherwise stated." Other things can be supporting evidence, but I don't think anything can ever serve as the main body of such an argument; as far as I see, no criterion that cannot also be accomplished in a single spacetime has been suggested (Other than trivial features that aren't very useful to bring up to begin with, like "Time was destroyed" or "Destroyed areas are inaccessible to time travelers").
I have to say I don't really agree with the whole "Being able to physically travel across different areas is proof they are not separate spacetimes," though, since as Agnaa said up there, our current definition of spatiotemporally separate realms still has them be displaced across a 5-D space, so there being some area between universes where you can move around is no counterevidence at all. At least not inherently.
I have to say I don't really agree with the whole "Being able to physically travel across different areas is proof they are not separate spacetimes," though, since as Agnaa said up there, our current definition of spatiotemporally separate realms still has them be displaced across a 5-D space, so there being some area between universes where you can move around is no counterevidence at all. At least not inherently.