File:Dune field in ESP 033272 1400 01.jpg
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Summary
editDescriptionDune field in ESP 033272 1400 01.jpg |
English: This is the caption that NASA provided with with image: This field of dunes lies on the floor of an old crater in Noachis Terra, one of the oldest places on Mars.
When there are perfect conditions for producing sand dunes—steady wind in one direction and just enough sand—barchan sand dunes form. The word “barchan” is a Russian term because this type of dune was first described in the desert regions of Turkistan. Barchans have a gentle slope on the upwind side and a much steeper slope on the lee side where horns or a notch often forms. The wind in this case came from the southwest. Observing dunes on Mars can tell us how strong the winds are, as well as their direction. If pictures are taken at regular intervals, one may see changes in the dunes and in ripples on the dunes’ surface. The color in the photograph is not the same as we would see with our eyes because an extra color (infrared) is added. Our eyes cannot detect infrared, but it is used because it can give us clues to the composition of the surface. On Mars dunes are often dark in color because they were formed from the common, volcanic rock basalt. In the dry environment, dark minerals in basalt, like olivine and pyroxene, do not break down as quickly as they do on Earth. Although rare, some dark sand is found on Earth, for example in Hawaii which also has many volcanoes discharging basalt. Written by: James Secosky (narration: Tre Gibbs) (2 October 2013) |
Date | 2013/10/02 |
Source | https://www.uahirise.org/ESP_033272_1400 |
Author | Jim Secosky suggested NASA take this image of this spot with HiRISE through the HiWish program. The image credit should read: NASA/JPL-Caltech/UArizona |
Location on Mars | 39° 55′ 26.4″ S, 4° 35′ 52.8″ W | View this and other nearby images on: Google Maps | -39.924000; -4.598000 |
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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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current | 00:10, 25 November 2023 | 1,386 × 2,048 (594 KB) | Jimmarsmars (talk | contribs) | Uploaded a work by Jim Secosky suggested NASA take this image of this spot with HiRISE through the HiWish program. The image credit should read: NASA/JPL-Caltech/UArizona from https://www.uahirise.org/ESP_033272_1400 with UploadWizard |
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Special instructions | FBMD01000a99010000ab860000ebe601000de701006ce70100d4dd0300b6f705007a1806009c180600d71806002e470900 |
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Original transmission location code | Vz8ZH6g9JdU1UD3vLymY |