The sky is blue because of something called “scattering.” When light from the sun reaches the earth, it travels through the atmosphere and runs into tiny particles, like air molecules. These particles are much smaller than the light waves, so they scatter the light in many different directions.
The color blue is scattered more than other colors because blue light waves are shorter than the other colors in the light spectrum. This means that when blue light hits an air molecule, it gets bounced around more easily than the other colors. As a result, more blue light reaches our eyes from all over the sky, making the sky appear blue to us.
This effect is similar to what happens when light shines through a prism and is separated into different colors, like red, orange, yellow, green, blue, indigo, and violet. It’s also why the sky appears different colors at different times of the day, like red and orange during sunrise or sunset.
So, the next time you look up at the blue sky, you’ll know that the blue color is coming from the scattering of light by the air molecules in the atmosphere.