This is an image of fog in a Martian canyon.
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Image from: NASA

Martian Fog

This picture shows fog on Mars. More fog has been seen in images returned by Mars Global Surveyor of the south polar region of Mars.

Martian fog may have a little bit of acid mixed in with the water drops. (Rain on Earth also contains a little bit of acid). Acid in the fog may contribute toward weathering of the Martian surface rocks.

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