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This is not exactly the twin paradox, but it's close. First, let's make the problem more precise. Let's assume the train is one light year away from a planet, traveling near light-speed, and at the v …
answered Aug 18 '15 by Jahan Claes
44
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longer, but it emits less energy per second. Both observers will agree on the total energy emitted by the flame (once they have accounted for possible red-shift) and thus total energy is conserved. …
answered Aug 15 '17 by Jahan Claes