Tag Archives: CO2 ice

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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HiRISE: Icy wonderland

Although the season is late spring, carbon dioxide ice still covers much of the surface at this high latitude site. It is still a chilly –128 degrees Celsius [–198° F]. The weak boundaries of the polygonal structure of the surface … Continue reading

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HiRISE: Polar smile

This image represents one of many monitoring sites at the South pole residual cap (SPRC). Images are taken throughout the Martian year to document changes in carbon dioxide ice coverage. This image shows a popular spot where one of the … Continue reading

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THEMIS: South polar textures

THEMIS Image of the Day, November 14, 2014. The numerous small depressions seen in this VIS image of the south polar cap are informally called swiss cheese. More THEMIS Images of the Day by geological topic.

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THEMIS: South polar textures

THEMIS Image of the Day, October 7, 2014. While yesterday’s VIS image showed a texture of oval depressions (Swiss cheese), today’s VIS image shows a linear surface texture of the south polar cap. This texture is described as looking like … Continue reading

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