- Why is the sky blue? Before discussing the sky being blue, let’s see what the sky really is. The sky is the part of the atmosphere that is seen from the surface of astronomical objects. What is air? If you’re thinking oxygen, you aren't completely right. Air is actually a mix of gases or the atmosphere. In Earth's case the air is mainly a mix of the gases of nitrogen and oxygen.
- So why is a part of the atmosphere blue? The molecules of the air molecules scatter the short wave-length (blue light) from the sun more than they scatter the other wavelengths in the light.
- At sunset or sunrise, the color changes to warmer colors because the blue light has been scattered away from the line of sight of the sun's direction leaving a gradient of red light. Clouds appear white, because their particles are thicker than the wave-lengths of light and scatter all colors evenly.
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http://en.wikipedia.org/wiki/Sky
http://math.ucr.edu/home/baez/physics/General/BlueSky/blue_sky.html
http://en.wikipedia.org/wiki/Diffuse_sky_radiation
http://en.wikipedia.org/wiki/Air
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