Mass and energy are interchangeable. Does that mean time and space are interchangeable too? Reason for question: The only difference I can comprehend between matter and energy is that energy has no duration; a photon does not age (even if the universe does). Matter has endurance, and travels through time. Close to a black hole (in regions of high gravitational fields), time slows, and the speed of light (as measured externally) would seem slower (would give doppler-like transformations); effectively time is converted into space; a photon may "appear" to take a year to travel a few yards (again, as seen from outside). But from the inside (the photon's-eye view) a light year is still a light year. So, can an area of space a few feet across (externally) be a light-year wide (internally) (TARDIS sort of thing)?
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