Is a clear sky really blue? You decide!

By  | May 16, 2018 | Filed under: Interesting Facts, News

So… You look up at a beautiful blue sky on a cloudless day. There’s nothing like it. But our atmosphere isn’t blue… Or is it? So why is this? Well, it took a long time for scientists to figure it out!

Now, we know that the light from the sun looks white. But, in reality, it is actually made up of all the colors of the rainbow. When white light shines through a prism, the light is separated into all its colors. A prism is a specially shaped crystal. Like energy passing through the ocean, light energy travels in waves, too. Some light travels in short, “choppy” waves. Other light travels in long, lazy waves. Blue light waves are shorter than red light waves.

prism

Sunlight reaches Earth’s atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered in all directions by the tiny molecules of air in Earth’s atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.

light scattering blue sky

And now you know! Thanks, NASA for the pics and the info!

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