File:Cunningham and Kertész craters EN0108828535M.jpg
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English: Mercury's giant Caloris basin is the best-preserved large impact basin known on Mercury, and the high density of craters on its floor indicates that the basin is fairly old and probably formed about 3.8 billion years ago. This NAC image shows an area on the plains that partially fill the Caloris basin floor. On the right portion of this image, the light-colored rays emanating from Cunningham crater (named for the American photographer Imogen Cunningham) show that this crater is relatively young; bright ejecta rays tend to darken with time, as the ejected material is gradually modified by impacting micrometeoroids and solar particles (a suite of different processes that together are called “space weathering”). Relative age relationships such as this one are used to unravel Mercury's geologic history. The similar-sized Kertész crater is also visible on the left side of this image. |
| Date | |
| Source | http://messenger.jhuapl.edu/gallery/sciencePhotos/image.php?gallery_id=2&image_id=187 |
| Author | NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington |
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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 | 17:13, 11 June 2008 | | 1,018 × 754 (487 KB) | Bryan Derksen (talk | contribs) | {{Information |Description={{en|1=Mercury's giant Caloris basin is the best-preserved large impact basin known on Mercury, and the high density of craters on its floor indicates that the basin is fairly old and probably formed about 3.8 billion years ago. |
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