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Why the sky wears a blue coat
Sunlight looks white, but it is actually made of every color of the rainbow mixed together. As these light rays race through our atmosphere, they crash into tiny gas molecules floating in the air. Because blue light travels in much shorter, choppy waves compared to red or yellow light, it gets bounced around in every single direction way more than the other colors. Scientists call this scattering. When you look up, you are basically seeing all that bouncing blue light spilling across the sky. Fun fact: sunsets turn red because the light has to plow through way more air, scattering away all the blue before it reaches your eyes.