Tag Archives: sand dunes

THEMIS: Frost-free dunes in the north polar sand sea

THEMIS Image of the Day, May 25, 2018. This VIS image shows part of Olympia Undae, a large dune field that surrounds part of the north polar cap. At the top of the image the dunes are small and isolated. … Continue reading

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THEMIS: Polar dunes and layers of ice and dust

THEMIS Image of the Day, May 24, 2018. This VIS image shows the margin between the polar cap and the surrounding plains. There are dunes on the plains at the top of the image. In the upper left corner it … Continue reading

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HiRISE: Dunes in Nectaris Montes

Sand dunes in Valles Marineris can be impressive in size, with steep slopes that seem to climb and descend. An enhanced-color cutout shows some of these on the slopes of Nectaris Montes within Coprates Chasma. The brighter bedforms are inactive … Continue reading

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HiRISE: Barchan Pac-Man

Barchan sand dunes are common on Mars and often form vast dune fields within very large (tens to hundreds of kilometers) impact basins. The regions upwind of barchans are usually devoid of sandy bedforms, so if you were walking in … Continue reading

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THEMIS: Basaltic sand dunes in Arabia Terra crater

THEMIS Image of the Day, May 3, 2018. A group of dunes is visible on the floor of this unnamed crater in Arabia Terra. The dunes contain basaltic sand, which is darker than the dust covered materials of the rest … Continue reading

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THEMIS: Juventae Chasma’s rubble collection

THEMIS Image of the Day, May 1, 2018. This VIS image runs from northern Juventae Chasma to just short of the southern canyon wall. Illustrating the variety of landforms within the chasma, this image contains the rough canyon floor at … Continue reading

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HiRISE: Channeled southern highlands

This enhanced color image shows the heavily channeled and ancient southern highlands of Mars. The elongated and jagged features are windblown dunes, perhaps hardened and eroded. [More at link]

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HiRISE: Tracking dune-alcove changes within Chasma Boreale dunes

Tracking dune-alcove changes within Chasma Boreale dunes. Beautiful Mars series. [More at links]

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HiRISE: Frosted dunes in north polar region

A soothing way to start your Monday. These polar dunes show both carbon dioxide frost (the while colored areas) along with darker material that’s been exposed due to sublimation, and is blown by the wind to form these dark spots. … Continue reading

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HiRISE: Dunes in western Medusae Fossae

Dunes in western Medusae Fossae. These dark dunes in the western Medusae Fossae Formation provide some evidence of being derived locally, probably coming from the north and because of the wind. Beautiful Mars series.

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