NASA/JPL_CaltechNASA/JPL_CaltechAt this point, you’re probably wondering why Martian sunsets appear blue. Thanks to the specific mix of molecules in our atmosphere, shorter wavelengths are scattered more effectively than longer wavelengths. What we see as the colour blue is particularly short on the wavelength front, and blue light gets bounced around so much that it makes the sky look blue. This chaotic combination means we end up seeing less blue light as other parts of the spectrum fall into the pot, ultimately making it appear whiter. (Volcanic aerosols scatter light too, which means that nearer the horizon, they can remove even more blue light, resulting in very red sunsets.)

Source: Forbes May 02, 2019 00:22 UTC