Tag Archives: High Resolution Imaging Science Experiment

HiRISE: Recent impact site in Noachis Terra

This image shows a recent impact in Noachis Terra in the southern mid-latitudes of Mars. The impact occurred in dark-toned ejecta material from a degraded, 60-kilometer crater to the south. Rather than a single impact crater, we see multiple impacts … Continue reading

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HiRISE: Plains with diverse lithologies

Plains with diverse lithologies. This observation was a “nadir” target, meaning our camera was pointing straight down at the surface. These pockmarked plains outside of a larger impact crater show some very nice colors. The top cutout is from our … Continue reading

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HiRISE: Layered sedimentary rocks in Meridiani Planum

Layered sedimentary rocks in Meridiani Planum. Ah, the loveliness of Meridiani. Meridiani Planum is a plain located south of Mars’ equator, in the westernmost portion of Terra Meridiani. It hosts a rare occurrence of gray crystalline hematite, which on Earth, … Continue reading

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HiRISE: Shallow craters

Shallow craters. These shallow craters are located in the relatively flat Amazonis Planitia, situated between the Tharsis and Elysium volcanic provinces, to the west of Olympus Mons. HiRISE Picture of the Day archive [More at links]

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HiRISE: An Olympus Mons landslide

An Olympus Mons landslide. Olympus Mons is too large for HiRISE to capture in one image, but we can get very detailed closeups of parts of it. Here, we see a slope streak, possibly caused by a boulder rolling downhill … Continue reading

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HiRISE: An elongated pit in Margaritifer Terra

An elongated pit in Margaritifer Terra. There is nothing more interesting than a feature that resembles a giant amoeba. Margaritifer Terra is an ancient, heavily cratered region, centered just south of the Martian equator, and covers 2600 kilometers at its … Continue reading

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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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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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