I got cornered in a discussion on the internet... I am not sure if I am right or not (I thought I was when I started). If you guys here tell me I am wrong, I have no problem admitting if I am indeed wrong first... person 2 said "Refraction =/= reflection. The atmosphere is colorless because it does not reflect any light, regardless of refraction.". Does atmosphere really does not reflect any light? It seems to me that at atomic level, Rayleigh Scattering is reflection of light between atoms. Due to different medium, the APPARENT velocity of light is different, but between the atoms, it´s still the same old constant C. What changes is the lenght of the path light travels to get across the medium. Isn´t it?