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The Speed of Light in Vacuum is Constant

-- Vesa | July 6, 2020

EHT image of event horizon in the central supermassive black hole of M87

Question:

Hi, The velocity of light is increasing (right ?). I wonder, when we consider the equation E=mc^2, it means that the ratio E/m increases as well. But are atomic and molecular structures very dependent on this ratio ? How would you comment ?

-- Vesa

Answer:

Well, in fact, prevalent theory and all observations done to-date indicate that the speed of light in a vacuum is constant. There are some theoretical predictions of a variable speed of light, but all of those theories are unproven.

-- Jeff Mangum

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