Why does Sunset in Mars appear to be blue?

Why does Sunset in Mars appear to be blue?

On Planet Mars, the sky is red during the day and the sunset is blue. The reason for this is that the dust particles always make a blue halo around the sun on Mars, but the halo is only easy to see when the light passes through all the dust while coming over the horizon. The normal hue of the sky during the daytime is a pinkish-red; however, in the vicinity of the setting or rising sun it is blue. This is the exact opposite of the situation of what happens on Earth. However, during the day the sky is a yellow-brown color. On Mars, Rayleigh scattering is usually a very small effect.

The light from the Sun scatters based on what’s in the atmosphere. Sunlight comprises light of many different wavelengths, and molecules and dust particles only interact with specific waves. The scattering of light by these particles is key to the color that we see. At sunset light has a longer distance to travel within the atmosphere, so it scatters more. What is left is the color that we see. On Earth, we have a wider palette of reds, which is actually amplified by ash from volcanoes and dust from fires. On Mars, we get a cool blue hue.

Earth and Mars are a bit like mirror worlds. Mars is the Red Planet while Earth is the pale blue dot. Earth's surface is covered by oceans, whereas the present surface of Mars has no liquid water and is covered with bare rock and dust.