Why Is the Sky Blue? & How Are Rainbows Made? | WonderKid STEM Adventure

[00:00:02]A sky factory?

[00:00:04]Oh, no. What happened?

[00:00:08]>> Emergency. [music] Blue sky production has stopped. Without blue light without blue light, the sky will turn white.

[00:00:15]>> Wait, who keeps painting the sky blue every morning?

[00:00:20]There has to be a secret.

[00:00:25]No way. More blue paint? That's way too much work. I can't even finish one picture before lunch.

[00:00:31]>> [laughter] >> Hey, come back. I only want one tiny hello. I've been traveling for 8 minutes. I need to stretch first.

[00:00:44]This is a very good imagination, Wonder Kid.

[00:00:48]I'm Photon. I came all the way from the sun. Really? That's super far. So, who makes the sky blue?

[00:00:56]Let's solve this mystery together.

[00:00:59]Then there's only one place to go.

[00:01:01]Whenever I find a mystery, I come here.

[00:01:04]My Wonder Tower. I've never seen anything like this. Come on, you always know everything.

[00:01:11]There we go. What?

[00:01:13]>> Looks like today's mystery hasn't been solved yet. The sun looks yellow, >> [music] >> but its light is actually white.

[00:01:20]>> Wait, so this is sunlight? It just looks white because all its colors are hiding together. Want to meet them?

[00:01:27]Whoa, the rainbow was hiding inside the sunlight? Whoa, the rainbow is turning into a giant wheel.

[00:01:35]>> Every color is still here. They're just getting ready to work together.

[00:01:40]>> Wait, where did all the colors go?

[00:01:43]>> They didn't disappear. They came back together.

[00:01:47]>> Huh? Wait a second.

[00:01:50]When I mix all my paints together, [music] I get this.

[00:01:53]>> That's because paint and light follow different rules.

[00:01:56]>> Why is the blue light bouncing so much?

[00:01:59]Because [music] blue light is much more energetic. It likes to change direction.

[00:02:03]Hmm. Earth's atmosphere is full [music] of tiny particles. When sunlight passes through, blue light gets scattered everywhere.

[00:02:11]>> [music] >> So wherever I look, This is Rayleigh scattering.

[00:02:17]So blue light is bouncing everywhere.

[00:02:20]By sunset, most blue light has already [music] scattered away. So only reds and oranges reach you. One rule, two amazing skies.

[00:02:32]Brainy.

[00:02:34]Speedy. Funny. I found the answer.

[00:02:37]>> [laughter] >> Why is the sky blue?

[00:02:42]Is blue.

[00:02:44]Giant bird with a paintbrush.

[00:02:46]I actually don't know. Ready? Let's see what's hiding inside sunlight. Did it break? Whoa! We made a rainbow. No, we didn't make it. We found it.

[00:02:57]>> [gasps] >> Last question. What did our rainbow experiment prove? White sunlight already contains every color. We didn't make the rainbow, we uncovered it. It proved the world's already full of amazing things.

[00:03:12]We just have to notice them.

[00:03:14]Thank you for the explanation, photon.

[00:03:17]See you next adventure.

[00:03:20]One small question led to an amazing answer, [music] and that's the magic of science. And the Wonder Tower is always open. Stay curious, keep wondering, and I'll [music] see you next time.