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Message: <blockquote data-quote="Umbran" data-source="post: 9807605" data-attributes="member: 177">I guess I wasn't clear.I, personally, here and now, cannot pass through one without the other.  I, personally, here and now, am restricted to motion governed by Einsteinian Relativity.  But I, personally, here and now, don't have a time machine.Time machines, in general concept, can violate Einsteinian Relativity.  If we are considering time travel, we are expecting to break those rules, such that, in principle, the movement in space and time are no longer linked, or are linked differently than we know today.Rather like, right now, I am more or less restricted to movement on the dry parts of the surface of an oblate spheroid called "Earth", at rather low speeds.  Put me in a car, and I can go faster.  Put me in a boat, and I am not restricted to the dry parts.  Put me in an airplane or rocket, and I am no longer restricted to the surface.  (emphasis mine) Not even Einsteinian Relativity requires that.</blockquote>