The Sky Is Blue Because Blue Light Scatters the Most

Sunlight looks white, yet the sky looks blue. NASA explains the difference. Sunlight reaches Earth’s atmosphere and is scattered in all directions by all the gases and particles in the air. Light energy travels in waves, and not all colors travel the same way. Some light travels in short, choppy waves, and other light travels in long, lazy waves. Blue light waves are shorter than red light waves. According to NASA, blue light is scattered more than the other colors because it travels as shorter, smaller waves, and it is scattered in all directions by the tiny molecules of air in Earth’s atmosphere. With blue light coming at us from every part of the sky, that is the color we see. In NASA’s words, this is why we see a blue sky most of the time.