You look up and the whole sky is blue.

But the Sun doesn’t look blue at all. It looks white or yellow.

So where is that blue coming from?

Sunlight travels through the air, and suddenly the light starts bouncing around.

Some colors spread everywhere. Others keep going straight.

It’s like tiny air molecules turning blue light into ping-pong balls and sending them in every direction.

That scattered blue glow is what reaches your eyes.

And without air, the sky wouldn’t be blue at all.