| Risultati della ricerca nelle immagini - "Protonilus" |
Psp_009719_2230_red.jpgFretted Terrain in Protonilus Mensae (possible True Colors; credits: Lunar Explorer Italia)55 visiteCaption NASA:"This observation shows Fretted Terrain in valleys located in Protonilus Mensae near the so-called "Crustal Dichotomy", such as the Region that separates the Southern Hemisphere Highlands from the Northern Hemisphere Lowlands.
Fretted Terrain is thought to involve movement of ice-rich material in its formation. The speckled texture of the valley fill (i.e. the Fretted Terrain) is probably due to sublimation, when ice goes directly from a solid to a gas, leaving behind empty space under the soil into which overlying material can collapse.
The linear striations in the valley fill mark the direction of movement. For example, in the valley near the top of the image (left), the material was moving across the scene.
Also in this scene, are several small craters in various stages of degradation".
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Mars Local Time: 15:20 (early afternoon)
Coord. (centered): 42,4° North Lat. and 48,1° East Long.
Spacecraft altitude: 295,4 Km (such as about 184,6 miles)
Original image scale range: 59,1 cm/pixel (with 1 x 1 binning) so objects ~1,77 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,4°
Phase Angle: 46,0°
Solar Incidence Angle: 46° (meaning that the Sun is about 44° above the Local Horizon)
Solar Longitude: 116,4° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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