File:12104marsbulls.jpg
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Summary
editDescription12104marsbulls.jpg |
English: 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. Diameter of the biggest rim is 700 m (an image with scale). The crater is located on the border of Arcadia Planitia and Amazonis Planitia. |
Date | Taken on 9 July 2010 |
Source | http://www.uahirise.org/ESP_018522_2270 |
Author | NASA/JPL/University of Arizona |
Licensing
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:10, 9 September 2015 | 2,560 × 1,920 (4.78 MB) | Huntster (talk | contribs) | Higher resolution version. | |
23:28, 5 July 2012 | 500 × 375 (145 KB) | Dgalicki (talk | contribs) |
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Metadata
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS4 Macintosh |
File change date and time | 16:12, 23 July 2010 |
Color space | sRGB |
Image width | 2,560 px |
Image height | 1,920 px |
Date and time of digitizing | 08:51, 15 September 2009 |
Date metadata was last modified | 09:12, 23 July 2010 |
Unique ID of original document | uuid:183BB7C606F9DD11BA66D1AD63D425C6 |