Does Mars have a blue sky?


There are a number of photos online that show Mars with a blue sky. Are these photoshopped?

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.

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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. No matter what type of rock it is, it will look reddish brown. Which is confusing for geologists.

So they do a white balance of the photograph. There is a bit of blue gets through the Martian dust in the atmosphere. So if you white balance it, you increase the amount of blue in the picture, and tone down the red, until the white balance is similar to an Earth landscape.


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