Tag Archives: impact craters

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: Impact near the south pole

This image shows a new impact crater that formed between July and September 2018. It’s notable because it occurred in the seasonal southern ice cap, and has apparently punched through it, creating a two-toned blast pattern. The impact hit on … Continue reading

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How do impacts make Mars central-pit craters?

[Editor’s note: From a paper by Samantha Peel and two co-authors recently published in the Journal of Geophysical Research.] Formation of central pits in impact craters on Mars: A statistical investigation of proposed mechanisms • Formation mechanisms for central pits … Continue reading

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THEMIS: Something odd in Noachis Terra

THEMIS Image of the Day, January 9, 2019. This VIS image shows a portion of Noachis Terra to the northeast of Argyre Planitia. In the middle of the image is an unnamed crater that is not even close to being … Continue reading

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HiRISE: Just another quiet day on Mars

Just another quiet day on Mars. This cluster of [impact] craters is located, ironically, in Utopia Planitia. Beautiful Mars series. [More at links]

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HiRISE: Impact crater near Tempe Terra

An impact crater near Tempe Terra. Despite this crater likely being extremely old and filled-in with material, we can still see its ejecta blanket. Beautiful Mars series. [More at links]

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HiRISE: Crater in the aureole of Pavonis Mons

A crater in the aureole of Pavonis Mons. This is an unusual crater in the Pavonis Mons aureole, possibly a glacial deposit. It appears to have secondaries or textured ejecta (sign of freshness), but is mostly infilled. It also has … Continue reading

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THEMIS: Crater rim gullies in Terra Sirenum

THEMIS Image of the Day, November 6, 2018. Numerous gullies dissect the northern rim of this unnamed crater in Terra Sirenum. The inside of the north rim faces away from the Sun and is more deeply gullied than the Sun-facing … Continue reading

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THEMIS: Soft-featured craters in Arcadia Planitia

THEMIS Image of the Day, October 19, 2018. This false-color VIS image shows some of the plains and craters located in Arcadia Planitia. The soft-looking features in the impact craters indicate ground ice at shallow depths below the surface. In … Continue reading

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HiRISE: Colorful impact

Some regions of Mars are not very colorful, but we can be surprised by local features. This image of an impact crater in the south Syrtis Major region was acquired as a “ride-along” with a CRISM observation, which targeted this … Continue reading

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