The Surprising Reason the Sky Is Blue

Have you ever looked up at the sky and wondered why it is blue?

The answer has to do with light and how it moves through the air.

Sunlight looks white or yellow, but it is actually made up of many different colors.

You can see these colors when you look at a rainbow after it rains.

The colors of light include red, orange, yellow, green, blue, and violet.

Each color of light moves in a different kind of wave.

Blue light has a shorter wave than red light.

When sunlight enters Earth's atmosphere, it hits tiny gas molecules in the air.

These molecules scatter the light in many directions.

Blue light scatters much more easily than the other colors because of its short waves.

This scattered blue light spreads across the whole sky, so we see blue when we look up.

Near sunrise and sunset, the sky often looks red or orange instead of blue.

This happens because the sunlight travels through more air at those times, and the blue light scatters away before it reaches your eyes.

Scientists call this process Rayleigh scattering, named after the scientist who discovered it.

So the next time you see a bright blue sky, you will know exactly why it looks that way!