When sunlight travels through the atmosphere, it collides with gas molecules. These molecules scatter the light. The shorter the wavelength of light, the more it is scattered by the atmosphere. Because it has a shorter wavelength than the other colors, blue light is scattered more, ten times more than red light, for instance.

That is why the sky is blue.

Take that!

5 comments :

Jeff Brownlee said...

My niece asked me this when she was about 3 and I basically gave her that answer, but with slightly more detail. That was about 7 years ago and I still remember the look on her face. :)

Chris said...

I once explained this to a 3 month old. She was so taken with my wisdom, she threw up on me.

Crisatunity said...

I thought it was because the sky was sad most of the time. Go figure: Science 1, Mysticism 0.

Me. Myself & Jonna said...

LOL @ Mysticism! Now THAT is original!

granati said...

er, yeah...what you said!

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