Traditional_Story834 t1_iz0xl4y wrote
Reply to comment by The_Dark_Passenger93 in How are we sure that speed of light and other basic constants are really constants on a large cosmological scale of time and space? by The_Dark_Passenger93
It's constant to the observer, perceived changes in the speed/energy of the light they are observing are actually changes in time itself. Measuring the actual speed of light is impossible.
Theoretically.
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