About 5 minutes

Why Is the Sky Blue?

Drill 1fd3c6

Look up on a clear day. The sky can be blue! Let's find out why.

1. Sunlight has colors

Sunlight looks white. It has many colors. They are like a rainbow.

Red, orange, yellow, green, blue, and violet hide in white light.

2. Air has tiny bits

Air is not empty. It has tiny bits. These bits are gas.

Sunlight hits the air. Some colors bounce more. Blue light bounces a lot.

It spreads all over the sky.

3. Eyes see blue

Blue light bounces here and there. Your eyes see blue all around.

Violet light bounces too. But your eyes see blue more. So the sky looks blue.

Try the bouncing light

Press the button. Watch the light go. It goes from Sun to eye.

The sky waits.

Quick quiz

1. Sunlight looks white. What is inside it?

Hint: rainbow.

2. Which color bounces most?

Hint: sky color.

3. At sunset the sky looks...

Hint: warm colors.

4. What does blue light do?

Hint: bouncing.

One more thing

At sunset, light moves through more air. Blue light moves away. It does not reach your eyes.

Red and orange light keeps going. The sky looks warm. It looks pretty.

Next time you see blue sky, remember. Tiny air bits bounce blue light around.