What happens when the sunlight travels through the Earth's...

According to Rayleigh scattering, the intensity of scattered light is inversely proportional to the fourth power of its wavelength, given by $I \propto \dfrac{1}{\lambda^4}$.

Since the wavelength of blue light is shorter than the wavelength of red light ($\lambda_{\text{blue}} < \lambda_{\text{red}}$), blue light is scattered much more strongly by the molecules in the Earth's atmosphere compared to red light.

Therefore, the blue colour is scattered more compared to the red colour.

Answer: The blue colour is scattered more compared to the red colour