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Originally Posted by Richard of Chelmsford
The sky on Mars is pink isn't it?
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That's what I always thought, but at the Tyndall link I just gave it says that this is only after a dust storm:
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Images sent back from the Viking Mars landers in 1977 and from Pathfinder in 1997 showed a red sky seen from the Martian surface. This was due to red iron-rich dusts thrown up in the dust storms occurring from time to time on Mars. The colour of the Mars sky will change according to weather conditions. It should be blue when there have been no recent storms, but it will be darker than the earth's daytime sky because of Mars' thinner atmosphere.
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