Why do we want to see blue skies on Mars? Because that is what we humans are familiar with. I love the color blue. I love blue planets. I think Neptune is a beautiful planet. There is something about the color blue that draws us.

So what about Mars sky? It’s sky color would depend on the amount of that rusty dust is in the air and you elevation. At times when there was very little dust in the air and if you were at a low elevation, you might see a blue sky turning dark as you looked up. At higher elevations, with low dust in the air, blue sky would turn to black sky as you looked up. You might even see a bright star (Or a bright planet like Earth or Jupiter- I wonder what Jupiter looks like from Mars?)

With more rusty dust in the air the air turn pink. With lots of dust, the sky looks dirty brown-red. Carl Sagan said, in Pale Blue Dot, that seasoned settlers on Mars would be able to tell when the last dust storm was buy the color of the sky.

Where else can we find blue skies in the Solar System?

If we could float or fly above the cloud deck of Venus, we would see blue skies. Same is true of Titan.

If we could fly through Jupiter’s atmosphere, we would see huge towering clouds and blue skies. Saturn would be similar. Uranus and Neptune would have blue skies in the upper atmosphere if they were closer to the Sun, but I am not sure if they get enough sunlight to have blue skies. They are probably a very dark blue.