• 5-24-2017 Why is the sky bright? If it were just blue air, the sky would be bright on the side where the sun is and dark on the other side. But the sky is uniformly bright all around. Why? Well, it's because the air molecules bend the light rays. Red light is not bent as much as blue rays, so distant objects, such as mountains, look red. The blue is bent more, so after going around several million molecules there is blue light coming at us from all directions. So wherever you look, the sky is blue, except when there is a mountain in the way, and then the mountain looks red. (Or purple, if you want to sing patriotic songs.)
  • Because it's the blue light rays that are reflected by the atmosphere.

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