why the sky is blue?

Answer 1

The colours of the sky result from the scattering of sunlight by the gas molecules and dust particles in the atmosphere. Sunlight consists of light waves of varying wavelenghts, each of which is seen as a different colour. The shortest light waves appear blue and the longest red. The blue light waves are readily scattered by tiny particles of matter in the atmosphere, but the red light waves travel undisturbed unless they are struck by larger particles.
When the sky is clear, the waves of blue light are scattered much more than those of any other colour. When the sky is dense, the light waves of all colours are scattered, causing the sky to turn grey. Undisturbed red light waves give the sun and the sky near the horizon a red or orange appearance at sunset or sunrise.

Answer 2

"The sky appears blue because air scatters short-wavelength light in preference to longer wavelengths. When we look toward a part of the sky not near the sun, the blue color we see is blue light waves scattered down toward us from the white sunlight passing through the air overhead. Near sunrise and sunset, most of the light we see comes in nearly tangent to the Earth's surface, so that the light's path through the atmosphere is so long that much of the blue and even yellow light is scattered out, leaving the sun rays and the clouds it illuminates red."

"Diffuse sky radiation : Color" : http://en.wikipedia.org/wiki/Diffuse_sky_radiation#Color

Answer 3

Because if it was green we wouldn't be able to differentiate between the sky and the grass. :)
I know that was stupid u don't have to tell me.
It has to do with the particles in the air diffracting sunlight into the six (indigo is blue) colours of the visible spectrum. I don't know how it works. But it is the same with the red sky at sunset and sunrise.

Answer 4

Space is black, and our atmosphere is a mixture of colors but basically is a light blue, so the black and the light blue make it a bit darker, hence, sky blue is born.

Answer 5

it is because of the reflection of the ocean....
when there is sunlight..you can clearly see that the sky is blue...
but if there are no sunlight...it isn't blue anymore

Answer 6

Rayleigh scattering

Answer 7

If you need a really scientific explanation then take a look at the link below

Answer 8

Nitrogen in the atmosphere.

Answer 9

It's the shortest wavelength that comes to the eyes.