Why is the sky blue?

 The sky appears blue because of a phenomenon called Rayleigh scattering, which is the scattering of light by small particles or molecules in the atmosphere. The shorter, blue wavelengths of light are scattered more than the longer, red wavelengths, resulting in the blue color we see in the sky.

Here's a more detailed explanation:

1. Sunlight enters Earth's atmosphere and is made up of a spectrum of colors, including all the colors of the rainbow.

2. The smaller molecules of gases like nitrogen (N2) and oxygen (O2) in the atmosphere scatter the light in all directions.

3. The shorter wavelengths of light, like blue and violet, are scattered more than the longer wavelengths, like red and orange. This is because the smaller molecules are more effective at scattering the shorter wavelengths.

4. As a result, our eyes perceive the blue light as it is scattered in all directions and reaches us from all parts of the sky.

5. The color of the sky can vary depending on the time of day, atmospheric conditions, and other factors, but the basic principle of Rayleigh scattering remains the same.

I hope that helps! Let me know if you have any other questions.