Tag Archives: Mars Reconnaissance Orbiter

HiRISE: Wind flow

The atmospheric pressure on Earth at sea level is about 1 bar. On Mars, the pressure is 6 to 10 millibars, or 1/100th that of our planet. But even in this atmosphere, wind still flows around obstacles. In this image … Continue reading

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HiRISE: Layered history

The geologic history of a planet is written in its layers. Erosion of the surface reveals several shades of light toned layers, likely sedimentary deposits. The most recent geologic features are the narrow sand dunes snaking across the top of … Continue reading

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HiRISE: Exposing the rock in impact craters

In this complex crater (about 44-kilometers in diameter), we see bedrock in several locations from different depths in the crust. The central uplift exposes large fragments of green-toned bedrock that possibly originated from several kilometers beneath the surface. To the … Continue reading

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MARCI weather report, Jan 28-Feb 3, 2019

Conditions across Mars were similar to that of the previous week. Dust hazes remained present over many southern hemisphere regions. Looking to the northern hemisphere, a couple of dust storms associated with the north polar hood were observed north of … Continue reading

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HiRISE: A dune field near Nili Patera

In this image many sand dunes are visible. They have an elongated crescent form and are called “barchan dunes.” They are formed by the continuous action of the wind, blowing in the same direction, giving this particular shape. The orientation … Continue reading

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HiRISE: A variety of surfaces and terrains

A variety of surfaces and terrains. This intriguing extraterrestrial terrain is located in the far northeast part of Acidalia Planitia, located between the Tharsis volcanic province and Arabia Terra to the north of Valles Marineris. HiRISE Picture of the Day … Continue reading

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HiRISE: Bedrock delights

Bedrock delights. These gorgeous bedrock formations are located in the Syrtis Major region, which is a low-relief shield volcano. HiRISE Picture of the Day archive [More at links]

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HiRISE: For your consideration

For your consideration. An alien landscape with dust devil streaks and craters slowing fading away into the mists of time. A twilight zone of geology, if you will. (Features like this are often called “thumbprint terrain”.) HiRISE Picture of the … Continue reading

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MARCI weather report, January 21-27, 2019

Elevated levels of atmospheric dust, remnants of a recently abated southern hemisphere regional storm, lingered over most of Mars this past week. At high southern latitudes, the perennial south polar ice cap had reached its minimum summer configuration. While in … Continue reading

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HiRISE: Landforms northwest of Herschel Crater

Landforms northwest of Herschel Crater. Herschel Crater is a 304 kilometer impact basin in the Martian Southern Hemisphere. We have imaged the crater enough times to learn that dunes here are not stationary but move over time. The crater is … Continue reading

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