Tag Archives: oblique impacts

THEMIS: Not quite round

THEMIS Image of the Day, July 23, 2018. This VIS image shows an unnamed crater in Noachis Terra. The crater is relatively young, with several different structures on the floor and rim still visible. The inner rim of the crater … Continue reading

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HiRISE: A triple crater

This image (making a stereo pair with ESP_041350_1455) shows an elongated depression from three merged craters. The raised rims and ejecta indicate that these are impact craters rather than collapse or volcanic landforms. The pattern made by the ejecta and … Continue reading

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HiRISE: Dragonfly-shaped crater

The broader scene for this image is the fluidized ejecta from Bakhuysen Crater to the southwest, but there’s something very interesting going on here on a much smaller scale. A small impact crater, about 25 meters in diameter, with a … Continue reading

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THEMIS: Hale Crater’s rugged central peaks

THEMIS Image of the Day, December 16, 2016. This VIS image shows part of the floor of Hale Crater. The mountains in the image are part of the elongated central peak of the crater. It is believed that Hale Crater … Continue reading

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THEMIS: Arabia Terra – false color

THEMIS Image of the Day, June 30, 2016. Today’s false color image shows part of the plains in Arabia Terra. The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a … Continue reading

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HiRISE: On the shapes of impact craters

The shape of a crater can depend on factors including the angle of impact and the pre-impact slope and topography. This image shows a roughly 3-kilometer impact crater, formed on the sloping walls of Tithonium Chasma, part of the large … Continue reading

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HiRISE: Tangential craters in Ptolemaeus Crater

This image shows two small craters, just touching on their rims, in the much larger Ptolmaeus Crater, which is located in the Martian Southern hemisphere. These craters are called “tangential craters.” The more degraded and filled-in crater is approximately 3 … Continue reading

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HiRISE: Recent impact in Elysium Planitia

This image shows a new impact crater in Elysium Planitia that was first discovered by the Mars Context Camera (CTX, also onboard the Mars Reconnaissance Orbiter) which formed between February 2012 and June 2014. It appeared as a dark streak … Continue reading

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HiRISE: Weird crater

This feature has a strange appearance, as if the crater has feet with toes sticking out of two sides. Let’s try to explain this. First, there was a highly oblique impact event, with the bolide (or meteorite) striking the ground … Continue reading

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THEMIS: Hecates Tholus

THEMIS Image of the Day, June 12, 2014. This VIS image shows part of the northern flank of Hecates Tholus, which is located on the northern part of the Elysium Volcanic Complex. More THEMIS Images of the Day by geological … Continue reading

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