Tag Archives: gullies

HiRISE: Distinctive brightness

This full-resolution image is centered on a bright deposit at the end of a gully channel. The bright deposit does not seem to be present in an image acquired several years earlier than 2009, and is likely to be very … Continue reading

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THEMIS: Gullies on a big dune

THEMIS Image of the Day, March 27, 2017. Today’s VIS image shows part of the large dune form on the floor of Russell Crater. The big dune is scarred by gullies, with little dunes gathering at the gullies’ ends. More … Continue reading

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HiRISE: Hanging valleys in Dao Vallis

Hanging valleys in Dao Vallis. Beautiful Mars series.

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HiRISE: Gullies in winter shadow

This is an odd-looking image. It shows gullies during the winter while entirely in the shadow of the crater wall. Illumination comes only from the winter skylight. We acquire such images because gullies on Mars actively form in the winter … Continue reading

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THEMIS: Rim gullies & dunes in Noachis crater

THEMIS Image of the Day, March 16, 2017. Today’s false color image shows part of the floor of an unnamed crater in Noachis Terra. A small field of dunes is visible in the bottom left corner of the full image, … Continue reading

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THEMIS: Ross Crater gullies

THEMIS Image of the Day, February 24, 2017. This VIS image shows Ross Crater in Aonia Terra. The crater rim is dissected by gullies, however these gullies are much smaller than those in yesterday’s image. More THEMIS Images of the … Continue reading

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THEMIS: Noachis Terra dunes and gullies

THEMIS Image of the Day, February 23, 2017. This VIS image shows part of an unnamed crater in Noachis Terra. Large gullies dissect the crater rim and dunes are located on the crater floor. (If gullies look like ridges, remember … Continue reading

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HiRISE: Scars of erosion

This large crescent dune in Kaiser Crater shows the scars of many types of seasonal erosional activities. Along its downwind slope are large gullies which are active during winter, when frost drives dune material downslope, carving out channels and creating … Continue reading

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HiRISE: Old features and new

This image covers a portion of a typical impact crater in Terra Sirenum at about 40 degrees south latitude on Mars. At the top of the image, outside the crater rim, there is a mid-latitude mantle, rough in places where … Continue reading

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HiRISE: Contrasting colors of crater dunes & gullies

Gullies are relatively common features in the steep slopes of crater walls, possibly formed by dry debris flows, movement of carbon dioxide frost, or perhaps the melting of ground ice. This example shows a section of crater wall from the … Continue reading

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