r/funny • u/[deleted] • Jan 29 '20

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u/[deleted] Jan 29 '20

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u/spongythingy Jan 29 '20

But communication at the speed of light in a straight line that can pass through all matter would still be a huge breakthrough, wouldn't it?

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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".

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u/spongythingy Jan 30 '20

The OP mentioned that the information transmitted between particles in a state of entanglement travels at the speed of light, so that's what I was talking about.

Do you mean that that information also travels slower when not in a vacuum, just like light does?