Tag Archives: ice

HiRISE: Go with the (bright) flow

Posted on September 19, 2017 by rburnham

Many slopes in the middle latitudes of Mars show icy flows or glaciers. The region shown here, in the south-facing slope of a crater, is unusual because the flows have bright highlights. The color and brightness variations are likely due … Continue reading →

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HiRISE: 500-Meter circular feature

Posted on August 25, 2017 by rburnham

500-Meter circular feature or possible crater. Beautiful Mars series.

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HiRISE: A world of snowy dunes

Posted on August 23, 2017 by rburnham

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: Within a crater in the Southern Highlands

Posted on July 27, 2017 by rburnham

Within a crater in the Southern Highlands. This is a very ancient crater, long filled-in. You can see polygonal patterns in the terrain, mainly due to the contraction of subsurface ice as the seasons change. Beautiful Mars series.

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THEMIS: Rock glaciers and ice in Deuteronilus

Posted on June 15, 2017 by rburnham

THEMIS Image of the Day, June 15, 2017. Do you see what I see? Looks like the letter L, or maybe someone sitting down. (THEMIS Art #126) More THEMIS Images of the Day by geological topic.

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HiRISE: On a field of sublimation

Posted on June 6, 2017 by rburnham

On a field of sublimation – Sublimation is a process where a solid directly turns into a gaseous state. Beautiful Mars series.

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HiRISE: New impact site in southern mid-latitudes

Posted on April 5, 2017 by rburnham

Over 500 new impact events have been detected from before-and-after images, mostly from MRO’s Context Camera, with a HiRISE followup. Those new craters that expose shallow ice are of special interest, especially at latitudes where not previously detected, to better … Continue reading →

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HiRISE: Icy flow in a crater

Posted on March 8, 2017 by rburnham

The material on the floor of this crater appears to have flowed like ice, and contains pits that might result from sublimation of subsurface ice. The surface is entirely dust-covered today. There probably was ice here sometime in the past, … Continue reading →

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HiRISE: Lace on Mars

Posted on December 22, 2016 by rburnham

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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HiRISE: Cracks in a crater’s ice

Posted on December 9, 2016 by rburnham

Many impact craters on Mars were filled with ice in past climates. Sometimes this ice flows or slumps down the crater walls into the center and acquires concentric wrinkles as a result. This image shows an example of this. There … Continue reading →

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