| Risultati della ricerca nelle immagini - "Valley" |
15-T-SchroteriVallis.jpgSchroteri Valley, from Lunar Orbiter 5 (3D)89 visiteOriginal caption:"Stereoscopic view of a part of Schroter's Valley, the meandering depression running from the upper right to the lower left corner of the anaglyph. This rille is about 7 Km wide and up to 1300 m deep. Within its flat floor is a second, sinuous rille whose tightly packed meandor loops are about 200 m deeper. The ridge that is seen in the upper left portion of the photograph is about 1600 m higher than the plateau surface into which the Valley is cut".
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APOLLO 15 AS 15-90-12309.jpgAS 15-90-12309 - Schroter's Valley & Aristarchus "C"94 visitenessun commento
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APOLLO 15 AS 15-93-12628 HR.jpgAS 15-93-12628 - Schroteri's Valley (HR)107 visitenessun commento
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PSP_005574_1720_RED_abrowse-00~0.jpgLayers and Slope-Streaks within Valleys along the Highland-Lowland Boundary (context frame - MULTISPECTRUM; credits: Lunexit)58 visiteThis image shows Slope Streaks and Layering on the walls of a valley along the border between the Martian Southern Highlands and Northern Lowlands (see the extra-detail mgnf. At the bottom of the valley and in the lower portion of the valley walls are many large dunes.
The Slope Streaks generally start at a point source and widen downslope as a single streak or branch into multiple streaks. Some of the Slope Streaks show evidence that downslope movement is being diverted around obstacles, such as large boulders. In particular, several of the Slope Streaks in this image appear to be diverting around individual dunes, with downslope movement occurring in the low troughs between the dunes. The darkest Slope Streaks are youngest and cross cut and lie on top of the older and lighter-toned Streaks.
The lighter-toned Streaks are believed to be dark streaks that are lightening with time as new dust is deposited on their surface.MareKromium
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PSP_008598_2155_RED_abrowse~0.jpgLineated Valley Fill in Coloe Fossae (MULTISPECTRUM; credits: Lunexit)66 visiteThis Region consists of several relatively straight and narrow canyons located near the boundary between the high-standing, heavily cratered areas of the Southern Hemisphere and the low, uncratered plains that cover most of the Northern Hemisphere of Mars.
Transitional areas such as this are known as the “Fretted Terrain” and are characterized by a complicated mix of cliffs, mesas, buttes, and canyons.
This image reveals a canyon with relatively steep and smooth walls. The floor of the canyon displays a complex set of ridges and grooves that are generally parallel to the canyon walls.
The material comprising the canyon floor is common observed in Fretted Terrain and is called "Lineated Valley Fill" (LVF).
The cause of the LVF texture is not well understood but may result from patterns of ice rich soils or ice loss. The linear alignment may be caused by the downhill movement of ice-rich soil, or glacial flow in dirty ice or ice-rich soil.MareKromium
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Psp_009011_1705_red.jpg"Apparent Valley", West of Ganges Chasma (natural colors; credits: Lunexit)60 visiteThis image shows an "Apparent Valley" North of a 37-Km long pit called Ophir Cavus. This valley is just West of another 155-Km long valley system called Allegheny Vallis, that also emanates from the pit.
The association of valleys with the pit suggests that water was released when the pit formed, perhaps when volcanic eruptions melted ice in the surface or subsurface.
The HiRISE image reveals light-toned units along portions of the plains and these could be minerals deposited by the flowing water or alteration of the plains by the water that once flowed here.MareKromium
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