Does Mars have a blue sky?

Not at all. They do it to help Earth geologists recognize rocks on Mars. We usually see rocks in good light here. Either a blue sky like that or an overcast day. On Mars the sky is of course a dull muddy brown. But that makes the colours on the surface pretty much all the same to human eyes. read more

Mars does also get blue sunrises and sunsets, then you just see a patch of blue in the region of the sky towards the setting sun. So pictures of blue sunsets on Mars may show colours as a human eye would see them. read more

Scientists say sunset on Mars would have a blue light, however, as the red dust in the atmosphere filters out much of the red light from the sun. As the sun dips lower in the sky, its light has to travel through the lower layers of the atmosphere where the dust is thicker. read more

Blue is the color of the sky in a colorless atmosphere, due to Rayleigh scattering. If the atmosphere contains no colored gases or particles, the sky should look blue no matter what. If it has a different color, that's due to stuff floating in it, or perhaps the gases are actually colored; e.g. if a planet's atmosphere contained large amounts of NO2, it would be reddish-brown. read more