Why the sky is blue? We all can look up to the sky and see its beautiful blue colour. Why is it blue, and not red, or white for instance? As I commented in the "Vegetables post", an object is coloured because of the light that it reflects. The white light from the sun contains all the wavelengths, but when it impacts on an object some of its wavelengths are absorbed and some reflected. For example blue objects reflect 'blue' light, which is light with a pretty short wavelength. There is a phenomena named Rayleigh scattering , that consists on the scattering of light by particles much smaller than its wavelength. This effect is especially strong when light passes through gases. Each of the wavelengths of light suffers a different scattering when it encounters the gas particles that form the atmosphere (nitrogen, oxygen...). This effect is more prominent in the case of short light wavelengths, that are the blue end of the visible spectrum, so the...
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