Light is a kind of energy that can travel through space. Lets find out what it has to do with why the sky is blue. Light
from the sun or a light bulb looks white, but it is really a mixture of many colors. The colors in white light are red,
orange, yellow, green, blue and violet. You can see these colors when you look at a rainbow in the sky.

The sky is filled with air. Air is a mixture of tiny gas
molecules and small bits of solid stuff, like dust.

As sunlight goes through the air, it bumps into the molecules and dust. When light hits a
gas molecule, it may bounce
off in a different direction. Some colors of light, like red and orange, pass straight through the air. But most of the blue
light bounces off in all directions. In this way, the blue light gets scattered all around the sky.

When you look up, some of this blue light reaches your eyes from all over the sky. Since you see blue light from
everywhere overhead, the sky looks blue.

In space, there is no air. Because there is nothing for the light to bounce off, it just goes straight. None of the light gets
scattered, and the "sky" looks dark and black

Now you understand why the sky is blue!

Special Thanks to for providing this experiment.
Why is the Sky Blue
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