Here's why:
* Dust: The Martian atmosphere is filled with fine dust particles, which scatter sunlight. This scattering is more effective at longer wavelengths (red and orange), giving the sky a reddish hue.
* Sunrise and Sunset: During sunset and sunrise, the sunlight travels through more atmosphere. This causes shorter wavelengths (blue and violet) to be scattered away, leaving behind the longer wavelengths, which create the blue hue.
It's important to remember that the exact colour can vary depending on factors like the amount of dust in the atmosphere, the time of day, and the season.
