Home > Our Planet > Why Is The Sky Blue? Why Is The Sky Blue? Our Planet Share on Pinterest Dr. Carolyn has a PhD in Astrophysics and she previous worked at NASA, Caltech, and the American Astronomical Society. In this video she discusses light waves and why the sky appears the color blue. Share on Pinterest Related Posts How The Earth Moves What Causes The Colors Of The Northern Lights? What Is Hidden Under The Greenland Ice Sheet? How The Grand Canyon Was Made How Do Ocean Tides Work?