What kind of matter does light travel the fastest through?



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    Light travels fastest when there is no matter to slow it down. This is because when light hits a particle of matter, it has to be absorbed by that particle and then radiated by that particle. This process repeats itself with every particle the light hits, slowing it down considerably. Light goes at its normal speed whenever there are no particles in its way. However, when light does have to travel through matter, it travels fastest through air, since there are relatively few particles in air to slow light down.

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