this post was submitted on 26 Oct 2025
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Remember that light in motion is electric and magnetic fields pushing and pulling each other along. Why that speed? Because it takes time for an electric field to create a magnetic field and vice versa
Our equations for EM waves (Maxwell's equations) predict light speed, and the same equations would predict c in any system, so long as reasonable values for the variables are known in that system
So 300 000 000 m/s isn't going to be a reasonable approximation of the speed of light in vacuum, but any alien that one about radio would probably have Maxwell's equations under some other name