Dosya:Dark Sand Cascades on Mars.jpg

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English: They might look like trees on Mars, but they're not. Groups of dark brown streaks have been photographed by the Mars Reconnaissance Orbiter on melting pinkish sand dunes covered with light frost. The above image was taken in April 2008 near the North Pole of Mars. At that time, dark sand on the interior of Martian sand dunes became more and more visible as the spring Sun melted the lighter carbon dioxide ice. When occurring near the top of a dune, dark sand may cascade down the dune leaving dark surface streaks -- streaks that might appear at first to be trees standing in front of the lighter regions, but cast no shadows. Objects about 25 centimetres across are resolved on this image spanning about one kilometre. Close ups of some parts of this image show billowing plumes indicating that the sand slides were occurring even when the image was being taken.
Polski: Wyjaśnienie: Może to wyglądać jak drzewa na Marsie, ale to nimi nie jest. Grupy ciemnobrązowych smug zostały sfotografowane przez Mars Reconnaissance Orbiter (MRO) podczas topnienia różowych piaszczystych wydm pokrytych lekkim mrozem. Powyższe zdjęcie zostało wykonane w kwietniu 2008 r. w pobliżu marsjańskiego północnego bieguna. W tym czasie, ciemny piasek z wnętrza marsjańskich wydm stawał się coraz bardziej widoczny, podczas gdy wiosenne słońce odparowywało (sublimowało) jaśniejszy lód, zestalonego dwutlenku węgla. Kiedy odwilż pojawiała się w pobliżu szczytów wydm, ciemny piasek kaskadami opadał w dół wydmy zostawiając ciemne smugi na powierzchni - smugi, które mogą przypominać nie rzucające cienia drzewa stojące na tle jaśniejszych obszarów. Przedmioty mające wymiary 25 centymetrów na tym zdjęciu, w rzeczywistości zawierają około kilometr w terenie. Zbliżenia niektórych fragmentów tego zdjęcia zawierają obłoki kurzu wzbudzone lawinami piasku które jeszcze trwały podczas uruchomienia migawki kamery.
Tarih
Kaynak HiRISE
Yazar NASA/JPL/University of Arizona

Local Mars time: 1:29 PM. Latitude (centered): 83.5 ° Longitude (East): 118.6 °. Range to target site: 319.6 km. Original image scale range: 32.0 cm/pixel (with 1 x 1 binning) so objects ~96 cm across are resolved. Map projected scale: 25 cm/pixel. Map projection: POLAR STEREOGRAPHIC Emission angle: 0.1 °. Phase angle: 63.4 °. Solar incidence angle: 63 °, with the Sun about 27 ° above the horizon. Solar longitude: 55.7 °, Northern Spring.

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Public domain Bu dosya NASA tarafından üretildiği için kamu malıdır. Aksi belirtilmediği sürece "NASA tarafından üretilen malzemenin telif hakkı olmadığı" NASA telif politikasında belirtilmiştir. (Bkz. Template:PD-USGov, NASA copyright policy page veya JPL Image Use Policy.)
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19 Ocak 2010

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güncel10.18, 19 Ocak 201010.18, 19 Ocak 2010 tarihindeki sürümün küçültülmüş hâli2.560 × 1.920 (4,18 MB)Originalwana{{Information |Description={{en|1=They might look like trees on Mars, but they're not. Groups of dark brown streaks have been photographed by the Mars Reconnaissance Orbiter on melting pinkish sand dunes covered with light [[:Category:Frost|f

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