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

Martian Fog

This is an image of fog in a Martian canyon. The presence of fog provides evidence of water, and a water cycle on Mars. More fog has been seen in images returned by Mars Global Surveyor of the south polar region of Mars.

Martian fog may contain a bit of carbonic acid, just as terrestrial rain also contains a little bit of acid. Acid in the fog may contribute toward weathering of the Martian surface rocks.

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The Mars '98 Landing Site

The Mars '98 lander was supposed to land in the south polar region of Mars. This image of layered terrain near the south pole was provided by the Mars Global Surveyor mission. In the image, ground fog...more

Weathering processes on Mars

Unlike the rocks of Earth, where there are many things which cause erosion, there are only two main weathering agents on Mars: wind and acid fog. Acid fog is very important, but because there is not a...more

Martian Volcanoes

On this map of Mars, the lightly cratered Tharsis Ridge is shown, as well as the heavily cratered Martian highlands (near the bottom of the picture), and Valles Marineris to the right. The volcanoes are...more

The Transfer of Water in Martian History

On Mars, the water is trapped, frozen, within the ground. Nevertheless, there is evidence for running water on Mars. When the water is melted and released to the surface, it will run from higher ground...more

The Martian Cryosphere

The drawing shows a crossection of the crust, and the unusual altitude variation of the Martian surface. The figure illustrates the depth of frozen ground at various latitudes, called the cryosphere. The...more

Martian Floods

Separate from the Martian outflow channels, or the river valley networks, are large Martian lakes (600 km, or ~1000 miles across) which exhibit evidence of a periodic and catastrophic release of water...more

Martian Fog

This is an image of fog in a Martian canyon. The presence of fog provides evidence of water, and a water cycle on Mars. More fog has been seen in images returned by Mars Global Surveyor of the south polar...more

Martian Orbital Eccentricity

The Martian climate is more influenced by the shape of the Martian orbit than the climate of the Earth is influenced by the shape of the Earth's orbit. The orbit of Mars is more oval-shaped than that...more

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