Tag Archives: northern lowlands

HiRISE: Translucent ice

Translucent ice. Also note the polygonal ground, another feature of expanding and contracting subsurface ice. Beautiful Mars series. [More at links]

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Crustal dichotomy: First a giant impact, then a superplume at the antipode

The result of collaboration between researchers at UC Berkeley, USA and the Institute of Earth Sciences, Taiwan, suggests a two-stage process to explain the martian crustal dichotomy. The dichotomy is a 5-km elevation difference between the northern and southern hemispheres … Continue reading

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Perfect beaches ruined by martian volcanoes

The presence of potential shorelines in the northern hemisphere of Mars suggests that Mars once had oceans. The non-constant elevations of these putative shorelines, however, do not support that hypothesis. Recent work [published in Nature] by Robert Citron and colleagues … Continue reading

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HiRISE: Seasonal frost on crater slopes

Seasonal frost on crater slopes. Beautiful Mars series.

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HiRISE: Dune maze craze

Dune maze craze. This image shows sand dunes on the northern plains in the spring, when the seasonal frost is sublimating (and making crazy patterns). The dunes have coalesced here into an interlocking maze. Polygons between the dunes are due … Continue reading

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HiRISE: Herd of dunes

Herd of dunes. Beautiful Mars series.

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HiRISE: A valley near the northern lowlands

The goal of this observation is to determine the source of the ridge within a possible moraine that is also present in another HiRISE image. A moraine is a mass of rocks and sediment carried down and deposited by a … Continue reading

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THEMIS: Shore of the sand sea

THEMIS Image of the Day, September 22, 2017. Siton Undae is a large dune field located in the northern plains near Escorial Crater. Siton Undae is west of the crater and is one of three dune fields near the crater. … Continue reading

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THEMIS: Low hill divides the dunes

THEMIS Image of the Day, September 21, 2017. Siton Undae is a large dune field located in the northern plains near Escorial Crater. Siton Undae is west of the crater and is one of three dune fields near the crater. … Continue reading

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THEMIS: “Dry spots” in the north polar sand sea

THEMIS Image of the Day, September 20, 2017. Siton Undae is a large dune field located in the northern plains near Escorial Crater. Siton Undae is west of the crater and is one of three dune fields near the crater. … Continue reading

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