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File:Slope Streaks in Acheron Fossae on Mars.jpg

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English: What creates these picturesque dark streaks on Mars? No one knows for sure. A leading hypothesis is that streaks like these are caused by fine grained sand sliding down the banks of troughs and craters. Pictured above, dark sand appears to have flowed hundreds of meters down the slopes of Acheron Fossae. The sand appears to flow like a liquid around boulders, and, for some reason, lightens significantly over time. This sand flow process is one of several which can rapidly change the surface of Mars, with other processes including dust devils, dust storms, and the freezing and melting of areas of ice. Acheron Fossae is a 700 kilometre long trough in the Diacria quadrangle of Mars.
日期
来源 HiRISE
作者 HiRISE, MRO, LPL (U. Arizona), NASA

The above image was taken by the HiRise camera on board the Mars Reconnaissance Orbiter which has been orbiting Mars since 2006. Local Mars time: 3:25 PM. Latitude (centered): 37.3 °. Longitude (East): 229.1 ° Range to target site: 290.4 km. Original image scale range: 58.1 cm/pixel (with 2 x 2 binning) so objects ~174 cm across are resolved. Map projected scale: 50 cm/pixel and north is up. Map projection: EQUIRECTANGULAR. Emission angle: 0.9 °. Phase angle: 51.8 °. Solar incidence angle:. 51 °, with the Sun about 39 ° above the horizon . Solar longitude: 144.7 °, Northern Summer.

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Public domain 本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zhNASA版权方针页面JPL图片使用方针。)
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