Why Is the Sky Blue?
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In this same way, the particles in the sky absorb the blue beams from the sun the most. Each different colored beam, or wave, has a different amount of energy. The addition or subtraction of energy makes some waves short and some waves long. The blue light has the shortest wave, so it is scattered the most by the particles in the air. Why, then, does the sky look blue instead of purple if violet has the shortest wavelength. Violet wavelengths are actually too short, and although we can see violet, our eyes are too sensitive to see this in air molecules, so we see the blue scattered the most. Also, the main three colors our eyes process are red, green, and blue. (This is why if you look very closely at the colors on an old-fashioned tv set, the little particles that make up the shapes are red, green, and blue.) Because of this, it is much easier for our eyes to see blue than it would be for them to see purple.
You might be wondering why the sky is no longer blue when there is a sunrise or sunset. Well, during a sunrise and sunset, the sun is farthest away from you. The farther the original white light is away from you, the more the light is scattered by the time it reaches your eyes. By the time you see the light, the blue light has been scattered so much that it is actually scattered away from where you are looking (where the sun is setting). Because the blue light is no longer visible, the remaining colors are the warmer colors- reds, oranges, and purples. This is why you see these colors when you look at a sunset.