Tag Archives: High Resolution Imaging Science Experiment

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: Secondary craters in bas-relief

This region of Mars has been sprayed with secondary craters from 10-kilometer Zunil Crater to the northwest. Secondary craters form from rocks ejected at high speed from the primary crater, which then impact the ground at sufficiently high speed to … Continue reading

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HiRISE: Immature spider terrain

Immature spider terrain — Completely in need of adult supervision, obviously. Beautiful Mars series.

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HiRISE: Silence of the south polar layered deposits

Silence of the south polar layered deposits. Beautiful Mars series.

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HiRISE: Lakebeds in Holden Crater

Holden Crater was once filled by at least two different lakes. The sediments deposited in those lakes are relatively light-toned where exposed, as we see in this observation. Each layer represents a different point in time and perhaps a changing … Continue reading

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HiRISE: Recent crater & bedrock in Meridiani Planum

Recent crater and bedrock in Meridiani Planum. Beautiful Mars series.

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HiRISE: Complex terrain on floor of Hellas Planitia

Complex terrain on the floor of Hellas Planitia. Beautiful Mars series.

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HiRISE: Sources of gullies in Hale Crater

HiRISE color can show mineralogical differences due to the near-infrared filter. The sources of channels on the north rim of Hale Crater show fresh blue, green, purple and light toned exposures under the the overlying reddish dust. The causes and … Continue reading

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HiRISE: Branching valley in Syrtis Major region

A branching valley in Syrtis Major region. Beautiful Mars series.

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HiRISE: Mesa in Noctis Labyrinthus

This small (0.4 kilometer) mesa is one of several surrounded by sand dunes in Noctis Labyrinthyus, an extensively fractured region on the western end of Valles Marineris. Heavily eroded, with clusters of boulders and sand dunes on its surface, this … Continue reading

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