Tag Archives: barchan dunes

HiRISE: Barchan dune changes

Barchan dune changes in the Hellespontus region. Beautiful Mars series.

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HiRISE: Dunes in northern summer

This dune field formed near the base of the North Polar cap. Dunes require a source of loose particulate material to form. The source of the northern dune fields around the polar cap may be from the layers of dusty … Continue reading

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HiRISE: Changing dunes of Wirtz Crater

The large dark feature is a classic Martian sand dune. Most sand on Earth is made from the mineral quartz, which is white and bright. On Mars, most sand is composed of dark basalt, a volcanic rock. For this reason, … Continue reading

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HiRISE: Barchan dunes

Consider the barchan dune. Beautiful Mars series.

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HiRISE: Barchan dunes, Dulovo Crater region

Barchan dunes in the Dulovo Crater region. Beautiful Mars series.

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HiRISE: Martian Morse code

These dark dunes are influenced by local topography. The shape and orientation of dunes can usually tell us about wind direction, but in this image, the dune-forms are very complex, so it’s difficult to know the wind direction. However, a … Continue reading

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HiRISE: Summer sand dunes

Mars’ permanent North Polar cap is ringed by sand dunes. In the winter and spring the dunes are covered by a seasonal cap of dry ice. Here, we see the dark dunes in the summer, bare of seasonal frost. Two … Continue reading

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HiRISE: Dark dunes on light bedforms

Dark dunes superimposed on light bedforms — some dunes just like to be in the spotlight. Beautiful Mars series.

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HiRISE: The changing sands

As of this date, MRO has been orbiting Mars for nine years. One benefit of MRO’s nearly three completed extended missions is the chance to see landscapes change over time. These barchan sand dunes are a case in point: these … Continue reading

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HiRISE: Barchan dune wonderland

Barchan dune wonderland — The dark spots are the result of sublimation. Beautiful Mars series.  

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