File:PIA21465 - North Polar Layers.jpg
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[modifica]DescrizionePIA21465 - 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. |
Data | 18 July 2010 (published 28 February 2017) |
Fonte | Catalog page · Full-res (JPEG · TIFF) |
Autore | NASA/JPL-Caltech/Univ. of Arizona |
Location on Mars | 85° 42′ 57,6″ N, 179° 22′ 04,8″ E | Posizione di questa e altre immagini su: Google Maps | ![]() |
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Questa immagine o filmato è stato catalogato dal Jet Propulsion Lab della National Aeronautics and Space Administration (NASA) degli Stati Uniti d'Americacon il Photo ID: PIA21465.Questo tag non indica lo status del copyright dell'opera ad esso associato. È quindi richiesto un normale tag di copyright. Vedi Commons:Licenze per maggiori informazioni. Altre lingue:
العربية ∙ беларуская (тарашкевіца) ∙ български ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ English ∙ español ∙ فارسی ∙ français ∙ galego ∙ magyar ∙ հայերեն ∙ Bahasa Indonesia ∙ italiano ∙ 日本語 ∙ македонски ∙ മലയാളം ∙ Nederlands ∙ polski ∙ português ∙ русский ∙ sicilianu ∙ slovenščina ∙ Türkçe ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/− |
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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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[modifica]Public domainPublic domainfalsefalse |
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Questo file è nel pubblico dominio perché creato dalla NASA. La politica sul copyright della NASA afferma che «il materiale della NASA non è protetto da copyright a meno che non sia specificato altrimenti». (NASA copyright policy e JPL Image Use Policy). | ![]() |
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attuale | 08:52, 2 apr 2017 | ![]() | 2 880 × 1 800 (6,2 MB) | Gnash (discussione | contributi) | Optimized file size. |
13:27, 18 mar 2017 | ![]() | 2 880 × 1 800 (6,66 MB) | Bammesk (discussione | contributi) | larger file (converted from TIFF) | |
04:49, 1 mar 2017 | ![]() | 2 880 × 1 800 (866 KB) | PhilipTerryGraham (discussione | contributi) | User created page with UploadWizard |
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