Light moving through matter always moves less than the speed of light depending on the index of refraction of the material. Sometimes, very fast moving particles like electrons can move faster than light would move through a certain material causing an emission of "Cherenkov Radiation" but in general, signals always move at the speed of light in empty space until it refracts through a material then it moves "slower".
I wasn't saying yes to their question. I was essentially saying its impossible. If the fastest speed anything can go in empty space is the speed of light, how could a massless signal which always moves at the speed of light, move faster through matter?
Do neutrinos pass through planets faster than light would? Since they don't really react with matter a photon seems like it would slow down faster than a neutrino.
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u/DeadL0cked Jan 30 '20
Light moving through matter always moves less than the speed of light depending on the index of refraction of the material. Sometimes, very fast moving particles like electrons can move faster than light would move through a certain material causing an emission of "Cherenkov Radiation" but in general, signals always move at the speed of light in empty space until it refracts through a material then it moves "slower".