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Re: Nothing Can Move in Spacetime

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Posted by AlexanderS on April 05, 19101 at 20:16:35:

In Reply to: Nothing Can Move in Spacetime posted by Nemesis on April 05, 19101 at 16:21:05:

No, no. Motion is the change of an object's position over time. There is nothing in general relativity which forbids this. What having four dimensions (macroscopic dimensions) forbids is an object 'moving' from a four dimensional perspective. Why? Because this requires a time dimension in addition to the four dimensions, making TWO time dimensions and three space dimensions, which, although perhaps a workable theory, probably does not apply in any fashion to our universe (although perhaps some strange twist of fate like F-theory might turn out to be right and then it would). It's an interesting concept, two time dimensions. I could go on endlessly about the endlessly interesting possibilities, but never the mind, eh? Suffice to say that our accepted framework permits motion from the perspective of three dimensions (our perspective in everyday life) but in the "absolute" four dimensions of space-time, there is no motion.

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