Unit 9 The Blue Sky

B: Joe asked me something about science just now.

But I didn't know the answer. G: I'm good at science.

Ask me. B: OK.

Why is the sky blue? G: I'll explain it in a simple way.

Light comes through the air from the sun in waves. B: The light is in many colors, right?

G: Right.

Blue light waves are smaller than air molecules. They sometimes get absorbed by these molecules. B: OK.

What happens then? G: Then the blue light waves scatter in many directions.

Your eyes see this blue light from above you, after it leaves the air molecules. B: So that is what makes the sky blue!

What happens to the other colors? G: They reflect off the things that they hit.

Your shirt is red because our eyes see the red light reflected from it. B: Now I understand why the sky is blue!