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@jon_valdes@mastodon.technology Well, specifically Rayleigh scattering is why the sky's blue. The light that doesn't get scattered gives the sunset colour.

But yeah, water molecules can cause Rayleigh scattering, but ice crystals are far too big. Instead, they diffract the light, which causes cool polar optical phenomena! Sundogs, light pillars, and irridescent clouds are among the most famous. :)

https://en.wikipedia.org/wiki/Cloud_iridescence