COLORS OF THE SKY

The atmosphere around us contains dust particles,water droplets and gas molecules.the white light coming from the sun passes through most of the gas and water droplets but the gas molecules are way larger than the wavelengths of light ,thus these molecules absorb the low level wavelengths(mostly blue but also violets and green)and afterwards they radiate the same color light out.in this way the blue light gets absorbed and radiated making the overhead blue .the remaining colors the yellows and reds make up the color of the sunlight thus the sun appears yellow.

During sunset the light reaches us from over a larger distance(we are moving away from the sun) thus more of it (the blues) are scattered and the yellows and reds more visible.The most spectacular shows occur when the air contains many small particles of dust or water. These particles reflect light in all directions. Then, as some of the light heads towards you, different amounts of the shorter wavelength colors are scattered out. You see the longer wavelengths, and the sky appears red, pink or orange.