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Bull's Eye Impact Crater (RAW Natural Colors; credits for the additional process. and color.: Elisabetta Bonora - Lunexit Team)
What caused the Central Pit within this Impact Crater: unusual Subsurface Layering or a lucky second impact? Impacts into layers of alternately strong and weak material – for example, ice rich versus non-ice-rich – produce terracing such as that seen between the Inner Pit and the Outer Rim. Scientists have used Terraced Craters to estimate the thickness of Lava Flows on the Moon and elsewhere. Uneven Sublimation and Periglacial Erosion of exposed ice-rich material in the interior of the Crater may explain why the small Central Pit is slightly offset from center relative to the Terrace and Rim of the larger Crater. 
The Pit in the center of the main feature could also be from a later Impact Crater striking inside and slightly off-center from the original. It has a Raised Rim, which is characteristic of impact craters and is difficult to explain with a layered target. While no ejecta from this later impact can be seen, the ejecta could have been removed by extensive periglacial modification. 
Additionally the Floor Fill around the Inner Crater resembles impact ejects elsewhere at this latitude, and some of the "Landslides" to the East could be flow-back of ejecta off the Walls of the larger crater.

Parole chiave: Mars from orbit - Craters - Unnamed Crater with "Bull's Eye" shape

Bull's Eye Impact Crater (RAW Natural Colors; credits for the additional process. and color.: Elisabetta Bonora - Lunexit Team)

What caused the Central Pit within this Impact Crater: unusual Subsurface Layering or a lucky second impact? Impacts into layers of alternately strong and weak material – for example, ice rich versus non-ice-rich – produce terracing such as that seen between the Inner Pit and the Outer Rim. Scientists have used Terraced Craters to estimate the thickness of Lava Flows on the Moon and elsewhere. Uneven Sublimation and Periglacial Erosion of exposed ice-rich material in the interior of the Crater may explain why the small Central Pit is slightly offset from center relative to the Terrace and Rim of the larger Crater.
The Pit in the center of the main feature could also be from a later Impact Crater striking inside and slightly off-center from the original. It has a Raised Rim, which is characteristic of impact craters and is difficult to explain with a layered target. While no ejecta from this later impact can be seen, the ejecta could have been removed by extensive periglacial modification.
Additionally the Floor Fill around the Inner Crater resembles impact ejects elsewhere at this latitude, and some of the "Landslides" to the East could be flow-back of ejecta off the Walls of the larger crater.

ESP_018496_1510_RED_abrowse.jpg ESP_018498_1480_RED_abrowse.jpg ESP_018522_2270-7-EB-LXTT.jpg ESP_018522_2270-7-MF-PCF-LXTT~0.jpg ESP_018534_1985_RED_abrowse-PCF-LXTT1.jpg
Informazioni sul file
Nome del file:ESP_018522_2270-7-EB-LXTT.jpg
Nome album:MareKromium / Mars Reconnaissance Orbiter (MRO)
Valutazione (4 voti):55555(Mostra dettagli)
Parole chiave:Mars / from / orbit / - / Craters / - / Unnamed / Crater / with / "Bull's / Eye" / shape
Copyright:NASA/JPL/Univ. of Arizona and Marco Faccin/Lunexit Team per l'additional process. ed il montaggio
Dimensione del file:1845 KiB
Data di inserimento:Lug 31, 2010
Dimensioni:3881 x 2091 pixels
Visualizzato:54 volte
URL:https://www.lunexit.it/gallery/displayimage.php?pid=27220
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