Why is the Sky Blue?

       It is actually no color, but to the human eye it appears to be blue.  It comes from the Sun.  The Sun acts like a crystal that projects electromagnetic rays of sunlight towards Earth.  The ray of sunlight is a rainbow of colors.  It shoots a rainbow across the atmosphere towards Earth.  The blue color has shorter wavelengths and it bounces around in the atmosphere.  The other colors have longer wavelengths and travel towards earth quickly, so they cannot be seen.