Have you ever looked up at the sky on a bright, sunny day and thought "Wow! The sky looks so beautiful and blue"? The more we think about our planet, and the darkness of space, the more that beautiful blue sky becomes a mystery. If our atmosphere is clear, and space is black, then why is the sky blue? Don't be embarrassed if you don't know the answer! It's not just a question for kids; plenty of adults don't know the answer either.


1. What is the Sky Made of?

Before getting into why the sky is blue, there has to be an understanding of what the "sky" is made of. The sky is basically the atmosphere, full of different molecules and particles. From space, it appears as a thin blue line, almost like a bubble around the Earth. It is comprised mostly of Nitrogen and Oxygen and other debris that get caught in the air. Light from the sun hits the atmosphere, and that becomes the sky!

blue sky made of BlackJack3D / Getty Images

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