Tag Archives: frost

HiRISE: A winter’s view of a gullied crater

This is the location with the most impressive known gully activity in the Northern hemisphere. Gullies are active in the winter due to carbon dioxide frost, but northern winters are shorter and warmer than southern winters, so there is less … Continue reading

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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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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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Frosty nights year-round may stir Mars dust

Some dusty parts of Mars get as cold at night year-round as the planet’s poles do in winter, even regions near the equator in summer, according to new NASA findings based on Mars Reconnaissance Orbiter observations. [The findings are reported … Continue reading

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HiRISE: Frosted dunes

Sand dunes cover much of this terrain, which has large boulders lying on flat areas between the dunes. It is now late winter here in the Southern hemisphere, and these dunes are just getting enough sunlight to start defrosting their … Continue reading

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HiRISE: Southern winter frost accumulations

This enhanced color HiRISE image shows several craters somewhere in the southern mid-latitudes of Mars. It is currently mid-winter in the Southern hemisphere, so we can observe accumulating frost (neon blues) on pole-facing slopes (i.e. south-facing) and in shadowed areas. … Continue reading

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HiRISE: Gullies with dramatic lighting

This image was acquired to look for frost on these generally equator-facing slopes, which are visible in the shadows after enhancing the brightness levels. It is also a dramatic image given the low-sun illumination. The color cutout has north down … Continue reading

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THEMIS: Crater dunes

THEMIS Image of the Day, April 18, 2016. Today’s VIS image shows a sand sheet with surface dune forms located on the floor of an unnamed crater in Vastitas Borealis. More THEMIS Images of the Day by geological topic.

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HRSC: Frosty Martian valleys

Nestled within the fractured rim of a vast impact basin on Mars are valley floors dusted in frost. At 2200 km wide and up to 9 km deep, the Hellas Basin is the largest impact crater on Mars. This scene, … Continue reading

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HiRISE: Contact between polar ice & surroundings

Contact between polar ice and surrounding features. Beautiful Mars series.

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