This is an image showing a Martian sunset.
JPL/NASA
Mars' Thin Atmosphere
This is image of a Martian sunset illustrates just how thin the Martian atmosphere is. In this image, the Martian sky appears pink and a little bit dark at sunset. Unlike the Martian sky, the Earth's sky is blue. If you would like to know why the Earth's sky is blue, check the Quickie Question, below.
The thin atmosphere may have something to do with the cold surface temperatures because of the lack of a greenhouse effect. The thin atmosphere may also have an affect on the strength of Martian winds.
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