The sky is blue during the day because of a phenomenon called Rayleigh scattering.

Here's the breakdown:

* Sunlight is made up of all colors of the rainbow.

* Blue light waves are shorter than other colors.

* When sunlight enters the atmosphere, it collides with air molecules.

* Shorter wavelengths (like blue) scatter more easily than longer wavelengths (like red).

* This scattered blue light reaches our eyes from all directions, making the sky appear blue.

Let me know if you'd like to know more about how the sky changes color at sunrise and sunset! 🌅