Why is the sky blue ?

To explain why is the sky is blue we still need to take a quick look at the sun and the atmosphere in understanding the role they play in the sky appearing blue. Light from the sun (sunlight) is composed of seven colors (rainbow colors) of different wavelength that blend perfectly to make the suns light white in appearance. This light from the sun is called white light. The different colors in sunlight (white light)can be seen by passing sunlight through a prism. 

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