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In a recent thread I incorrectly stated that an observer moving at a high velocity relative to a co-moving observer would measure the age of the universe as more than the co-moving observer would. Apparently that is incorrect, and the age of the universe measured by the first observer would be less than that measured by the co-moving observer. I'm just curious as to how this works.
Is it possible to explain this using just SR and moving reference frames, or do we need to invoke GR?
Is it possible to explain this using just SR and moving reference frames, or do we need to invoke GR?