this post was submitted on 01 Dec 2023
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The density of the atmosphere matters.
Because scattering happens when photons hit particles, so the more particles the more scattering.
Light coming at you thru the atmosphere from above has a much shorter trip through the atmosphere than light coming at you near the horizon.
The longer path length means more chances to hit particles and scatter and the higher frequency 'blue-er' light gets filtered out more or absorbed and reradiated as a lower frequency light, more so than the lower freq red/yellow light.
Photons should be fully transparent right?
Yes, more stuff means more scattering, but scattering happens at all scales.
Photons don't cause absorption or scattering with themselves, no, but they do interfere. The interference really only shows up when the waves are nearly in-phase, so random light rarely interferes, but it should happen.
Photons aren't matter anyway, so I can't make a substance out of them. The rest of the bosons should interact with light even less, although the gravity of their energy might bend it the tiniest amount.