Ever wonder why the sky is blue, vs. say red, orange or purple? An effect called Rayleigh Scattering is part of the reason we see only blue, despite it all starting with a rainbow of colors.

But that same phenomenon can also sometimes make skies look red or orange. Here's a breakdown of how and why it all happens. It Takes The Entire Rainbow Of Colors To Make The Sky Blue.

Duane W. Hamacher receives funding from the Australian Research Council. Some people think the sky is blue because of sunlight reflected off the ocean and back into the sky. But the sky is blue ...