Together, as Lord Rayleigh explained, the molecules of these gases scatter the blue colors of sunlight much more effectively than the green and red colors. Therefore, a clean sky appears blue. In many places air pollution causes haze that causes the sky to appear pale blue or even milky white.When white light shines through a prism, the light is separated into all its colors. A prism is a specially shaped crystal.
If you visited The Land of the Magic Windows, you learned that the light you see is just one tiny bit of all the kinds of light energy beaming around the universe--and around you!
Like energy passing through the ocean, light energy travels in waves, too. Some light travels in short, "choppy" waves. Other light travels in long, lazy waves. Blue light waves are shorter than red light waves.