File:PIA21465 - North Polar Layers.jpg
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[edit]DescriptionPIA21465 - North Polar Layers.jpg |
English: The North Polar layered deposits are a 3-kilometer thick stack of dusty water ice layers that are about 1000 kilometers across. The layers record information about climate stretching back a few million years into Martian history.
In many locations erosion has created scarps and troughs that expose this layering. The tan colored layers are the dusty water ice of the polar layered deposits; however a section of bluish layers is visible below them. These bluish layers contain sand-sized rock fragments that likely formed a large polar dunefield before the overlying dusty ice was deposited. The lack of a polar ice cap in this past epoch attests to the variability of the Martian climate, which undergoes larger changes over time than that of the Earth. The map is projected here at a scale of 50 centimeters (19.6 inches) per pixel. [The original image scale is 63.6 centimeters (25 inches) per pixel (with 2 x 2 binning); objects on the order of 191 centimeters (75.2 inches) across are resolved.] North is up. The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colo. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington. |
Date | 18 July 2010 (published 28 February 2017) |
Source | Catalog page · Full-res (JPEG · TIFF) |
Author | NASA/JPL-Caltech/Univ. of Arizona |
Location on Mars | 85° 42′ 57.6″ N, 179° 22′ 04.8″ E | View this and other nearby images on: Google Maps | 85.716000; 179.368000 |
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This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA21465. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Other languages:
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This media is a product of the Mars Reconnaissance Orbiter mission Credit and attribution belongs to the High Resolution Imaging Science Experiment (HiRISE) team, NASA/JPL-Caltech/Univ. of Arizona |
Editors' note: Depicted width of this image: about 1300 meters (0.8 miles), per scaled images [1], [2] |
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Licensing
[edit]Public domainPublic domainfalsefalse |
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 | 08:52, 2 April 2017 | 2,880 × 1,800 (6.2 MB) | Gnash (talk | contribs) | Optimized file size. | |
13:27, 18 March 2017 | 2,880 × 1,800 (6.66 MB) | Bammesk (talk | contribs) | larger file (converted from TIFF) | ||
04:49, 1 March 2017 | 2,880 × 1,800 (866 KB) | PhilipTerryGraham (talk | contribs) | User created page with UploadWizard |
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