Why Is The Sky Blue?

Answer 1

It is the result of sunlight meeting with the Earth's atmosphere approximately 8 miles above the Earth's surface.

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The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.

However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.
http://www.sciencemadesimple.com/sky_blue.html

Answer 2

It is due to the Tyndall effect, also called Rayleigh scattering. Longer wavelengths of light (red, orange, yellow end of the spectrum) pass through the atmosphere and come directly to you if you look directly at the sun. The shorter wavelengths of light (blue end of the spectrum) are more readily scattered by the oxygen gas in the atmosphere. So, if you were to look directly at the sun when it is overhead (don't do this, you can hurt your eyes!), it will look white or yellow, depending on if all the wavelengths come through or if the shorter wavelengths have been scattered. If you look away from the sun, the red, orange and yellow wavelengths of light aren't scattered and so don't come to your eyes, but the blue has been scattered, so you see blue when you look at the sky in other directions where the sun isn't, so the sky looks blue. Here are a couple of websites that go into detail:

http://spaceplace.nasa.gov/en/kids/misrsky/misr_sky.shtml

http://www.sciencemadesimple.com/sky_blue.html

http://math.ucr.edu/home/baez/physics/General/BlueSky/blue_sky.html

http://science.howstuffworks.com/question39.htm

Answer 3

Are you serious?
It's due to a scattering of light rays that reflects the blue end of the spectrum.

Answer 4

The sky reflects (through a way I am not 100% sure about) what covers most of the earth, and that is water.

Answer 5

the sky absorbs every color but blue so it reflects in a blue color showing you blue unless its cloudy and gray resulting because of rain build up in the clouds :]

Answer 6

because even though light consists of loads of colours the earths atmostphear filters all the colours except blue.

Answer 7

Cuz Chuck Norris says so

Answer 8

It's gray right now.

Answer 9

Today is grey and rainy.

Answer 10

to match the color of your eyes..