Why is the sky blue?

Quick answer

Your child learns that white sunlight hides every color, and the sky looks blue because tiny air bits bounce the blue part to our eyes from every direction — plus why astronauts above the air see black.

Lesson

Mira looks up on her walk. The sky is big and blue, with no clouds at all. 'Mama, who painted the sky blue?'

Back home, a sunbeam slips through the window and touches the water glass. Look — a tiny rainbow lands on the floor! White sunlight secretly carries every color inside.

Mama shines her torch, and tiny dust bits bounce its light — that's why we can see the beam. The sky is full of tiny air bits too. They love to bounce the blue part of sunlight.

Outside, sunlight pours into the sky. The tiny air bits begin bouncing the blue — up, down, all around. What color will fill the whole sky?

Blue bounces off tiny air bit after tiny air bit, so blue reaches our eyes from every direction. That's why the whole sky looks blue. Blue bounces best!

High above the air, astronauts see a black sky — there are no air bits up there to bounce the blue. Down here, our air paints the day blue for us. Say it with Mira: blue bounces best!

Lesson scenes

Who Painted the Sky?

Mira looks up on her walk. The sky is big and blue, with no clouds at all. 'Mama, who painted the sky blue?'

A Rainbow Hides in White

Back home, a sunbeam slips through the window and touches the water glass. Look — a tiny rainbow lands on the floor! White sunlight secretly carries every color inside.

Tiny Air Bits Bounce

Mama shines her torch, and tiny dust bits bounce its light — that's why we can see the beam. The sky is full of tiny air bits too. They love to bounce the blue part of sunlight.

The Bouncing Begins

Outside, sunlight pours into the sky. The tiny air bits begin bouncing the blue — up, down, all around. What color will fill the whole sky?

Blue From Every Direction

Blue bounces off tiny air bit after tiny air bit, so blue reaches our eyes from every direction. That's why the whole sky looks blue. Blue bounces best!

The Astronaut's Secret

High above the air, astronauts see a black sky — there are no air bits up there to bounce the blue. Down here, our air paints the day blue for us. Say it with Mira: blue bounces best!

Key takeaways

• Who Painted the Sky?
• A Rainbow Hides in White
• Tiny Air Bits Bounce

Mini quiz

• Which color do the tiny air bits bounce best?
• Why does the whole sky look blue?
• What do astronauts see above the air?

Common questions

What will kids learn in Why Is the Daytime Sky Blue??

Your child learns that white sunlight hides every color, and the sky looks blue because tiny air bits bounce the blue part to our eyes from every direction — plus why astronauts above the air see black.

Read-together tip

Science lessons work best when the idea can be seen: light changes, rain forms, ice melts, sound vibrates, or a force makes something move.