Tag Archives: Mars Odyssey

THEMIS: Patterns on patterns in the Olympia Undae dunes

THEMIS Image of the Day, July 19, 2019. Today’s VIS image shows a small portion of Olympia Undae. Olympia Undae is a large dune field that dominates the plains along part of the north polar cap. This image was collected … Continue reading

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THEMIS: Channels on the edge of Arabia Terra

THEMIS Image of the Day, July 18, 2019. This VIS image is located on the margin of Arabia Terra and Acidalia Planitia. The channel features were created by fluids running from the highland of Arabia Terra into the lower elevations … Continue reading

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THEMIS: Hephaestus Fossae’s enigmatic channels

THEMIS Image of the Day, July 17, 2019. This VIS image is located in the central portion of Hephaestus Fossae. Hephaestus Fossae is a complex channel system in Utopia Planitia near Elysium Mons. It has been proposed that the channel … Continue reading

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THEMIS: Wind-etched ground near Gordii Dorsum

THEMIS Image of the Day, July 16, 2019. Wind is one of the remaining active processes altering the surface of Mars. In regions of long term unidirectional winds, the dust and sand is winnowed away. In places with poorly cemented … Continue reading

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THEMIS: Hills of Arena Colles

THEMIS Image of the Day, July 15, 2019. Today’s VIS image shows part of Arena Colles. The term colles means hills. Arena Colles is located on the margin where Terra Sabaea steps down in elevation into Utopia Planitia. Explore more … Continue reading

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THEMIS: Edge of the caldera on Ascraeus Mons

THEMIS Image of the Day, July 12, 2019. Today’s VIS image is located on the summit of Ascraeus Mons, one of the three large Tharsis region volcanoes. This image clips just the edge of the large summit caldera. Explore more … Continue reading

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THEMIS: Scamander Vallis’ winding course

THEMIS Image of the Day, July 11, 2019. Today’s VIS image shows a section of Scamander Vallis. Scamander Vallis is located in northern Terra Sabaea. Explore more THEMIS Images of the Day by geological subject.

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THEMIS: Wind-etched sediments in Gordii Dorsum

THEMIS Image of the Day, July 10, 2019. The most common active process affecting the surface of Mars today is erosion by the wind. In areas of poorly cemented surface materials, the effect is more easily seen. This image near … Continue reading

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THEMIS: Radial crater ejecta in Utopia

THEMIS Image of the Day, July 9, 2019. Today’s VIS image shows part of an unnamed crater in Utopia Planitia. The ejecta surrounding the crater rim shows both layering and radial grooves. These features formed during the impact event. Explore … Continue reading

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THEMIS: Hills and graben in Cerberus Fossae

THEMIS Image of the Day, July 8, 2019. The two linear depressions at the bottom of today’s VIS image are part of Cerberus Fossae. The features are termed graben and are formed by crustal extension that allows material to subside … Continue reading

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