Colors in the sky

As the final fall colors fade, we can get a “refill” by looking up. And when it comes to the sky, we learn a lot from its colors.

Start with a cloudless day. We all know that deep blue means clean dry air while a milky sky is the sure sign of moisture. This is true because tiny water droplets reflect all the sun’s colors equally. When red, green, and blue light strike us simultaneously the mix looks milky white. Since . . .

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