What will be the colour of the sky as seen from the Earth if there were no atmosphere?

Why does the sky appear blue when we look at it?

According to Rayleigh, when sunlight travels through the atmosphere, the amount of scattering is proportional to the $n^{\text{th}}$ power of the wavelength of light. Then the value of '$n$' is:

Why does the Sun have an elliptical shape at the time of sunrise and sunset? It is due to:

What is scattering of light? And on what factors does the scattering depend?

During the scattering of light, the amount of scattering is inversely proportional to the . . . . . . of the wavelength of light.