Why Is the Sky Blue?


Cyrus explains how light, color, and our sky or atmosphere works. Part of the answer even includes prisms. What’s a prism? Watch and find out! And witness the wackiness that often occurs at the Inspero HQ. Look out for the Mystical Rainbow Unicorn! A rare sighting indeed!


Why Is the Sky Blue?

Couldn’t the sky be green, pink or purple?

Green Sky

Green Sky

Pink Sky

Pink Sky

Purple Sky

Purple Sky

 

 

1st Thing to Understand: How Light Works

Sun Shines on Earth

Sun shines white light on Earth.

The sun shines white light onto the earth. White light is actually all of the colors mixed together. This can be shown with a prism, which looks like this.

The triangular glass-like object is called a prism and it separates white light into all of the colors that make it up. And as you can see it produces a rainbow.

Prism

This is a Prism

Prism Showing Rainbow

Prism Showing Rainbow

 

 

2nd Thing to Understand: Our Atmosphere

Earth's Atmosphere

Earth’s Atmosphere

Our planet is surrounded by something called an atmosphere. What does our atmosphere look like to you and me? It looks like the sky. Our atmosphere is made up of all the gases or air around our Earth.

So when the sun’s white light hits the Earth’s atmosphere, the light rays collide with the gases in the air, which act like a prism, and blue light scatters across the sky more than any other color.

The Earth’s atmosphere scatters blue light more than any other color

That’s Why Our Sky Is Blue

Sun In Blue Sky

Sun In Blue Sky

The reason our atmosphere doesn’t scatter all the colors equally like a prism is because blue is a shorter light wave so it scatters more. Other colors have longer wavelength and pass right through our atmosphere.

Blue Light Scatters More

Blue Light Scatters More


Credits

Why Is the Sky Blue?

Executive Producers
Jim Demetriades and Nikos Iatropoulos

Directed by
Luke Gschwend and Joseph Rohrs

Hosted by
Cyrus Rohrs

Written and edited by
Luke Gschwend

Production Assistant
Gwynne Rohrs

Title Animation & Animation
Jonathan Reaux

Images

Designed by Freepik

Music

Licensed through Audiojungle: “Epic” by Nstring

Resources

  • www.sciencemadesimple.com/sky_blue.html
  • www.physics.org/article-questions.asp?id=108

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