beautiful nature

The remainder are colloidal particles, the atmosphere is filled with argon gas, water (both in the form of water vapor and ice crystals), and various dense particles such as dust, burning particles (pollutants), and also salts (especially for areas above sea level ).
The sun that enters the atmosphere meets the gas molecules and the dust particles.

Light colors that have longer waves of light such as red and yellow, can pass through the molecules of gas and dust before. But the blue color that has shorter waves of light reflected back into the atmosphere. That's why the sky looks blue.

The same principle applies also to water in the sea or lake that looks blue.
Previously the sun was white. The sun emits electromagnetic waves in all visible light spectra

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