Question: why is the sky blue?

Chloe Kinsella answered on 14 Nov 2014:

When you look at the suns light, it appears to be white. But it is in fact made up of all the colours of the rainbow. Light energy travels in waves, just like energy passes through the ocean as waves. Each colour of the rainbow in the suns light travels as a different types of wave. The blue waves are the shortest, much shorter than the red waves and other colours. When sunlight reaches the earths atmosphere it gets scattered by all the gases and particles in the air. Scattered basically means it gets divided up into its different colours. As blue has the shortest wavelength this is the one that gets scattered the most in all different directions. For this reason it becomes the most visible colour in the sky.