What makes the sky look blue? justify your answer.?

Question

What makes the sky look blue? justify your answer.?

Answer 1

The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.

However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.  

Answer 2

The sky looks blue because the light coming through the atmosphere and is scattered and blue is scattered more because of it's wavelength. Because at sunset the light must travel through more atmosphere the sky looks red because red and yellow wavelengths are able to be seen because the blue wavelengths have been scattered even further.

This website shows a better explanation with images.