File:Mars, Hale-gully-bright-deposit.jpg
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DescriptionMars, Hale-gully-bright-deposit.jpg |
English: This image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter shows gullies near the edge of Hale crater on southern Mars. The view covers an area about 1 kilometer (0.6 mile) across and was taken on Aug. 3, 2009.
Martian gullies carved into hill slopes and the walls of impact craters were discovered several years ago. Scientists are excited to study these features because, on Earth, they usually form through the action of liquid water -- long thought to be absent on the Martian surface. Whether liquid water carves gullies under today's cold and dry conditions on Mars is a major question that planetary scientists are trying to answer. The gullies pictured here are examples of what a typical Martian gully looks like. You can see wide V-shaped channels running downhill (from top to bottom) where the material that carved the gully flowed. At the bottom of the channel this material empties out onto a fan-shaped mound. The fans from each gully overlap one other in complicated ways. At the tops of the channels, large amphitheater-shaped alcoves are carved in the rock. The material removed from these alcoves likely flowed downhill to the aprons through the gullies. The terrain in this image is at 36.5 degrees south latitude, 322.7 degrees east longitude. Gullies at this site are especially interesting because scientists recently discovered actively changing examples at similar locations. Images separated by several years showed changes in the appearance of some of these gullies. Today, planetary scientists are using the HiRISE camera to examine gullies such as the one in this image for change that might provide a clue about whether liquid water occurs on the surface of Mars. Full-frame images from this HiRISE observation, catalogued as ESP_014153_1430, are at http://hirise.lpl.arizona.edu/ESP_014153_1430. The image was taken at 2:21 p.m. local Mars time, with the sun 54 degrees above the horizon. The season was summer in the southern hemisphere of Mars. Image Credit: NASA/JPL-Caltech/University of ArizonaFrançais : Photo prise par la caméra à haute résolution (HiRISE) de la sonde spatiale Mars Reconnaissance Orbiter d'une ravine ( située sur le flanc du cratère Hale dans l'hémisphère sud de Mars. La partie photographiée fait 1 km de large. Les coodonnées du lieu photographié sont : 36.5 ° sud, 322.7 ° est
Ces ravines récentes qui ont été découvertes depuis quelques années pourraient être formées par des écoulements de boue ou des écoulements secs. |
Date | |
Source | NASA JPL n°ESP_014153_1430 |
Author | NASA JPL |
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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 | 18:06, 20 September 2009 | 1,347 × 4,170 (2.18 MB) | Pline (talk | contribs) | {{Information |Description={{en|1=This image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter shows gullies near the edge of Hale crater on southern Mars. The view covers an area about 1 kilometer ( |
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