The atmosphere around the earth is air. It contains molecules of many types of gases and water droplets or steam. The highest among the gases is about 78 percent nitrogen and about 21 percent oxygen. Also there is argon gas and water.
It contains dust, ash and salt from sea water etc. We think the color of our sky is sky because of these things. Actually what we call color is light. Light travels in waves or waves. Things in the air block these waves. Longer waves have less interference.
They are bigger than dust particles. That is, red, yellow and orange waves of light are not visible. But small waves are stopped by particles of gas or dust. And this light collides and spreads all around. Blue color travels in short waves in the spectrum of light. When this blue color spreads, it seems to be the color of the sky.
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