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The speed of light is a fundamental universal constant that marks the maximum speed at which energy and information can propagate. Its value is $299792458\frac{\mathrm{m}}{\mathrm{s}}$.

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Is there some theory which predicts that the speed of light in vacuum is constant for all ob...

On the Wikipedia page, https://en.m.wikipedia.org/wiki/Derivations_of_the_Lorentz_transformations, under the section "From Group Postulates", one can deduce that there is a constant speed for which ti …
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