Risultati della ricerca nelle immagini - "Polygons" |
0110-PolygonsandTower.JPGExtremely Unusual Surface Features (High-Def-3D; credits: Dr M. Faccin & Lunar Explorer Italia)90 visitenessun commentoMareKromium
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Clouds_over_Vastitas_Borealis-20080610a-PCF-LXTT.jpgClouds over Vastitas Borealis (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)131 visiteCaption NASA:"Northern Springtime means clouds. These clouds are close enough to the surface to be affected by this crater".
Nota Lunexit: se quanto la NASA scrive nella caption fosse completamente corretto, allora - molto probabilmente - ciò che si vede in questo frame NON SAREBBERO nuvole (almeno NON nel senso "terrestre" del termine), bensì delle nebbie molto fitte.
Se Vi piace, potremmo magari parlare di Evidenze di Umidità in aree prossime al Datum, insomma, e non di "nuvole basse" (anzi: bassissime!)...
Coord.: 74,4° North Lat. and 290,0° East Long.MareKromium
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ESP_011630_0930_RED_abrowse.jpgFans and Polygons (Natural Colors; credits: Lunar Explorer Italia)54 visitenessun commentoMareKromium
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ESP_011792_0980_RED_abrowse.jpgFans and Polygons (Natural Colors; credits: Lunar Explorer Italia)54 visitenessun commentoMareKromium
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ESP_012251_0935_RED_abrowse.jpgJust like Magnetic Fields (Natural Colors; credits: Lunar Explorer Italia)54 visitenessun commentoMareKromium
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North_Polar_Features-Polygons-PIA07354-1.jpgNorth Polar "Polygons" (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)236 visitenessun commentoMareKromium
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PHOE-SOL001-PIA10693.jpgMartian Surface (Approximate Colors; credits: NASA/JPL-Caltech/University of Arizona/Texas A&M )53 visitenessun commentoMareKromium
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PHOE-SOL101-lg29506-29507-29518_copia2.jpgVastitas' Surface, according to Lunexit - Sol 101 (Superdefinition and natural colors; credits: Dr G. Barca)69 visitenessun commentoMareKromium
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PSP_002070_2250_RED_abrowse-00.jpgPolygons in Utopia Planitia (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 86 visiteThis observation, in the Utopia Planitia, is marked by Depressions in the Mantle, several of which have coalesced together and now possess Scalloped edges and Layers.
Scalloped pits, such as these, are typical features of the Mid-Latitude Mantle and are most commonly found at approx. 55° both North and South Latitude; in the Utopia Planitia, Scalloped Terrain is found between 45-50° North latitude where the Mantle is highly discontinuous. The presence of Scalloped Pits has led to hypotheses of the removal of Sub-Surface material, possibly interstitial ice, by Sublimation. Scalloped Depressions in the Utopia Planitia have also been interpreted to be "Thermokarst Lakes" created by melting of Permafrost (frozen ground) and collapse of the dry Surface Layer.
Scalloped Pits typically have a steep Pole-facing Scarp and a gentler Equator-facing Slope. This is most likely due to differences in solar heating.MareKromium
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PSP_002070_2250_RED_abrowse-03.jpgPolygons in Utopia Planitia (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 109 visiteOn the Surface surrounding the "Scalloped Depressions" there are several large Boulders (see this EDM). Sources for these rocks may include Ejecta from nearby Craters, Volcanic Floods, or Boulders emplaced by Glaciers or Periglacial Processes.
Also on the surrounding Surface is a Polygonal Pattern of Fractures. This is commonly associated with Scalloped Terrain, and indicates that the Surface has undergone stress, potentially caused by Subsidence, Desiccation, or Thermal Contraction.
Variations in the sizes of the Polygons seems to be partly dependant on their location with small Polygons appearing within the Scallops and larger Polygons appearing outside the Scallops on the Surface of the Mantle. Several cracks cut through the side of the Scallops indicating that they must be at least as deep as the Scallops. The Polygons may have been present previous to the erosion of the Mantle. The formation of some Scalloped Depressions is believed to be an ongoing process today. MareKromium
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PSP_006962_2215_RED_abrowse.jpgPolygonal Terrain (Natural Colors; credits: Lunexit)68 visitenessun commentoMareKromium
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PSP_007173_2245_RED_abrowse-00~0.jpgScallops and Polygons in the Utopia Planitia Region (context frame - MULTISPECTRUM; credits: Lunexit)55 visiteThis image shows a portion of the Utopia Planitia, marked by polygonal features bounded by cracks and depressions in the mantle that possess scalloped edges.
Scalloped pits are typical features of the Martian mid-latitude mantle. Their presence has led to hypotheses of the removal of subsurface material, possibly interstitial ice, by sublimation (ice going directly from the solid state to the gas state). Their formation most likely involves development of oval- to scalloped-shaped depressions that may coalesce together, leading to the formation of large areas of pitted terrain. Scalloped pits typically have a steep pole-facing scarp and a gentler equator-facing slope.
On the surface surrounding the scalloped depressions is a polygonal pattern of fractures. This is commonly associated with scalloped terrain, and indicates that the surface has undergone stress, potentially caused by subsidence (sinking), desiccation (drying out), or thermal contraction. These polygon features are similar to permafrost polygons that form in polar and high alpine regions on Earth by seasonal-to-annual contraction of the subsoil. On Earth, such polygon features are indicative of the presence of ground ice.MareKromium
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