Tag Archives: CO2 ice

HiRISE: A world of snowy dunes

It is spring in the Northern hemisphere when we took this image. Over the winter, snow and ice have inexorably covered the dunes. Unlike on Earth, this snow and ice is carbon dioxide, better known to us as dry ice. … Continue reading

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HiRISE: Spider terrain

Spider terrain. Beautiful Mars series.

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THEMIS: South polar textures as local summer ends

THEMIS Image of the Day, June 8, 2017. This VIS image of the south pole was taken at the end of summer. Frost will soon start to form as the season transitions into fall. Fall in the southern hemisphere means … Continue reading

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HiRISE: Lace on Mars

Some seasonal ice on Mars is transparent so that the sunlight penetrates to the bottom of the ice. Heat from this sunlight can turn the ice directly into a gas in a process called sublimation and this gas can scour … Continue reading

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Small troughs may grow from gas-jet ‘spiders’

Erosion-carved troughs that grow and branch during multiple Martian years may be infant versions of larger features known as Martian “spiders,” which are radially patterned channels found only in the south polar region of Mars. Researchers using NASA’s Mars Reconnaissance … Continue reading

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HiRISE: Fans on crater rims

Gas under pressure will choose an easy escape route. In this image, the terrain is covered with a seasonal layer of dry ice. The weak spots, for gas sublimating from the bottom of the seasonal ice layer to escape, appear … Continue reading

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HiRISE: Coolest landscape on Mars or Earth

Many Martian landscapes contain features that are familiar to ones we find on Earth, like river valleys, cliffs, glaciers and volcanos. However, Mars has an exotic side too, with landscapes that are alien to Earthlings. This image shows one of … Continue reading

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HiRISE: Seasonal monitoring of ‘Inca City’

Seasonal monitoring of region dubbed “Inca City.” Beautiful Mars series.

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HiRISE: Frosty alcoves on Kaiser Crater dunes

Kaiser Crater hosts a large field of sand dunes. Every winter the dunes are covered with a layer of seasonal carbon dioxide ice (dry ice). In early spring the ice begins to sublimate (going directly from solid ice to gas). … Continue reading

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Gullies carved by CO2 ice, not water?

Mars’s gullies may be formed by dry ice processes rather than flowing liquid water, as previously thought. This is the conclusion of a study conducted by two French scientists published online on December 21st in Nature Geoscience. They show that, … Continue reading

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