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Concentric Craters, Astroavani - Avani Soares

Concentric Craters

Concentric Craters, Astroavani - Avani Soares

Concentric Craters

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Concentric craters

Can you forget Endymion for a moment and focus on a small detail?

Look at the picture carefully and see if you notice something different.

Realized that little concentric crater just below Endymion?

It is part of a very special group of craters that still generate a large debate.

This concentric crater still unassigned and about 6.5 km of the arrow in the picture, caught my attention because it is a classic concentric and still have a small craterelet almost exactly in the center thus giving the whole a target print. This can be seen in the picture attached in 3D obtained from the Quick Map.

The Concentric Craters, or DC, are smaller Moon features that have been ignored at least for some 30 years. But now some scientists examined these features again. David Trang University of Hawaii and colleagues Jeff Gillis-Davis, Ray Hawke and Ben Bussey, published and recently presented a paper at the Lunar & Planetary Science Conference, where they report that found 14 more CCs than a previous list made 30 years ago, using it for data from the Clementine, Kaguya and LRO probes to distinguish and confirm the identified features. Almost all the researchers now agree that the main crater is a small impact crater, normal and the question is whether the inner ring or torus is formed in association with the impact or is the result of some endogenic modification (endogenic is a word that It means that something has been created internally rather than created by external forces). The group of David found evidence against the hypothesis that the torus is formed by a simultaneous double layered impact in the target by volcanic activity or viscous relaxation. They noted that the distribution of CC along the edges of the seas is very similar to the fractured inside craters. As it is believed that the interior Fractured craters are impact craters modified by igneous intrusions, they proposed without details that these intrusions can also modify the interior of CCs. This is consistent with evidence that the CCs have a spectral signature virtually identical to the material located beyond the crater rim, implying that there was at least this point, volcanic extrusions. David showed this with the DC Firmicus C crater 14 kilometers in diameter, as an evocative example of volcanic material that can be associated with CC but mostly is not visible. The small dark spot on the torus seems to be pyroclastic excavated by small impact crater. It will be interesting to follow the work of these researchers and see if they will be able to find the same type of feature in other CCs and if they can develop an explanation of how an intrusion would create the morphology of the CC.

Source: Space Today

Adaptation and text: Avani Soares

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Concentric Craters, Astroavani - Avani Soares