One of the most striking features of the sky is its color. During the day, the sky appears blue due to a process called Rayleigh scattering. This occurs when the sun's light enters the earth's atmosphere and is scattered by the air molecules. Blue light is scattered more than any other color, which is why the sky appears blue. At sunrise and sunset, the sky takes on a range of colors, from deep oranges and reds to soft pinks and purples. This is due to a process called refraction, w...