why is the sky blue?

Answer 1

Light from the sun has all of the wavelengths. The blue light component of the sunlight spectrum, has the shortest wavelength of visible colors. It is thus scattered most easily.(by dust and salt particles etc., that are in the air.) , and that is why the cloudless sky is usually blue most of the day. At dusk or dawn the light is not straight above but is angled which means it passes through more amosphere and has a greater chance to scatter. Therefore light of longer wave length is scattered and shows up in the sky (like red and orange etc.) at sunset or dawn.
Hope that makes sense.
Doc. Dan.

Answer 2

he case was finally settled by Einstein in 1911, who calculated the detailed formula for the scattering of light from molecules; and this was found to be in agreement with experiment. He was even able to use the calculation as a further verification of Avogadro's number when compared with observation. The molecules are able to scatter light because the electromagnetic field of the light waves induces electric dipole moments in the molecules.
A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

Answer 3

Quite simply, the light that's coming from the sun is of all of the light-wave spectrum; basically, the color is white light. White light is a combination of all of the other colors, black is the absence. The reason that we see blue is that our atmosphere filters out all of the other colors in the white light. If we had a different type of atmosphere, we would see red, or green or a host of other colors!

Answer 4

because it is that's why