Tag Archives: HiRISE

HiRISE: How old are martian gullies?

Gullies eroded into the steep inner slope of an impact crater at this location appear perfectly pristine. Although at first glance it may appear that there are craters superimposed on the gully fans, inspection of HiRISE stereo coverage shows that … Continue reading

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HiRISE: Layers in a mid-latitude depression

Layers in a depression on a crater floor in the northern mid-latitudes. Beautiful Mars series.

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Opportunity landing site in color

A new observation from NASA’s Mars Reconnaissance Orbiter (MRO) captures the landing platform that the rover Opportunity left behind in Eagle Crater more than 13 years and 27 miles (or 44 kilometers) ago. A series of bounces and tumbles after … Continue reading

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HiRISE: It shrinks! It cracks!

Given enough time, impact craters on Mars tend to fill up with different materials. For instance, some craters on Mars had lakes inside them in the past. When these lakes dried out, they left behind traces of their past existence, … Continue reading

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HiRISE: Dune transition in high southern latitudes

Sand dune populations on Mars can vary widely with respect to morphology, relief, and activity. One of the most striking examples occurs with the many dune fields of the high Southern latitudes. When we venture south of -60 degrees latitude, … Continue reading

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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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