why the sky is blue?

Well I just read that on another Site and I have to say I never knew this and I am amazed I never even thought about why the sky is blue so this is an interresting question

It is blue because of Raleigh(sp?) scattering. When electromagnetic radiation hits a particle and the particle is less than half the wavelength of the radiation it induces a dipole moment in the particle. This dipole moment then oscillates slightly out of phase with the incoming radiation producing a scattered radiation pattern. The color of light that gets through this scattering effect is towards the blue end of the spectrum. At sunset and dawn the sky in those areas switches to the red end of the spectrum because the light is traveling through more atmosphere than if it was directly on top of you. In a related question the ocean is blue simply because they sky is blue because water itself does not really have a color, unless there is a lot of plant life in the water that might give it a green tinge. For the reference of those not scientifically inclined all forms of light from microwaves, infrared, visible, ultraviolet, through cosmic rays, are forms of electromagnetic radiation.

Sky is not only in blue. Anything in the world, When we see in long distance, that will be show like blue..... This is scientific nature...

I think this is a favourite colour of gods, so they select this colour for sky.