Mars Reconnaissance Orbiter (MRO)
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PSP_001334_2645_RED_abrowse-00.jpgNorth Polar Layered Deposits in Head Scarp of Chasma Boreale (CTX Frame - Natural Colors; credits: Lunexit)55 visitenessun commentoMareKromium
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PSP_001334_2645_RED_abrowse-01.jpgNorth Polar Layered Deposits in Head Scarp of Chasma Boreale (EDM - Natural Colors; credits: Lunexit)55 visiteThis EDM shows the NPLD at top and darker materials at bottom exposed in a Scarp at the head of Chasma Boreale, a large canyon eroded into the Layered Deposits.
The Polar Layered Deposits appear of a brown/reddish color because of dust mixed within them, but they are ice-rich as indicated by previous observations. The water ice in the Layered Deposits is probably responsible for the pattern of fractures seen near the top of the scarp.
The darker material below the Layered Deposits may have been deposited as sand dunes, as indicated by the cross-bedding (truncation of curved lines) seen near the middle of the Scarp.
It appears that brighter, ice-rich layers were deposited between the dark dunes in places.
Exposures such as these are useful in understanding the recent climate variations that are likely recorded in the Polar Layered Deposits.MareKromium
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PSP_001348_1770_RED_abrowse-00.jpgUnusual Crater in Meridiani Planum (Natural Colors; credits: Lunar Explorer Italia)74 visiteQuesto è il context frame dal quale è stato estratto il particolare controverso che potete vedere nella Sezione "X-Mars" (frame "What is THAT???"). La colorizzazione è quanto di più realistico si possa ottenere usando la metodologia Made by Lunexit denominata "MULTISPECTRUM".
In questo frame, oltre al dettaglio che ha "intrigato" tanti Amici Lettori, potete vedere (e BENE) anche un elemento che, di fatto, supporta la nostra idea/ipotesi per cui, (poco) al di sotto della Superficie di Meridiani Planum, vi potrebbe essere un ulteriore ambiente (una sorta di intercapedine) destinato ad ospitare - magari stagionalmente - delle acque correnti e - chissà - forse anche delle Forme Vitali Indigene.
Il bolide che ha scavato questo cratere senza nome, infatti, se ci fate caso, pare aver sfondato l'ambiente-intercapedine il quale, per come appare in questa immagine, potrebbe trovarsi a non più di 8/10 metri al di sotto del Datum (o Altitudine Zero).
Solo "Fantasie"? Staremo a vedere...MareKromium
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PSP_001348_1770_RED_abrowse-01.jpgUnusual Crater in Meridiani Planum (EDM-JP2; credits: Dr M. Faccin)54 visitenessun commentoMareKromium
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PSP_001348_1770_RED_abrowse-02.jpgUnusual Crater in Meridiani Planum (SuperEDM-JP2 - Natural Colors; credits: Dr M. Faccin & Lunar Explorer Italia)54 visitenessun commentoMareKromium
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PSP_001364_2160-PCF-LXTT.jpgEast Mareotis Tholus (Absolute Natural Colors; credits for the additonal process. and color.: Dr Paolo C. Fienga - Lunar Explorer Italia)230 visiteMars Local Time: 15:22 (early afternoon)
Coord. (centered): 35,9° North Lat. and 274,9° East Long.
Spacecraft altitude: 287,9 Km (such as about 179,9 miles)
Original image scale range: 57,6 cm/pixel (with 2 x 2 binning) so objects ~ 1 mt and 73 cm across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 1,1°
Phase Angle: 49,1°
Solar Incidence Angle: 48° (meaning that the Sun is about 42° above the Local Horizon)
Solar Longitude: 133,5° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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PSP_001367_1620_RED_abrowse.jpgGratteri Crater (Natural Colors; credits: Lunexit)54 visitenessun commentoMareKromium
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PSP_001370_2505_RED_abrowse.jpgIce Patch or Frozen Lake? (Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)54 visitenessun commentoMareKromium
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PSP_001374_1805_RED_browse-00~0.jpgLayering in Exhumed Crater at Meridiani Planum Region (context image - MULTISPECTRUM; credits: Lunexit)54 visite...Noi, detto senza falsa modestia, sfidiamo la NASA a fare di meglio...MareKromium
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PSP_001390_1735_RED_abrowse.jpgCandor Chasma (Natural Colors; credits: Lunexit)72 visitenessun commentoMareKromium
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PSP_001390_2290_RED_abrowse.jpgLobate Debris Apron in Tempe Terra/Mareotis Fossae (Natural Colors; credits: Lunexit)97 visiteThis image shows a portion of a large Lobate Debris Apron along the bottom of a hill in the Tempe Terra/Mareotis Fossae Region of Mars.
Debris Aprons were first discovered in Regions of "Fretted Terrain" from analyses of images sent back by the Viking Orbiter Spacecrafts in the 1970s. Features in areas of Fretted Terrain appear "softened" as if some geologic process(es) had smoothed and rounded features that normally would be sharply defined, such the crest of a narrow, steep ridge.
Scientists inferred that the processes causing this degradation must have involved the incorporation and creep of ice in the surface materials. If so, these mixtures of ice and debris could have flowed away from topographically high areas leaving features much less sharply-defined.
The flow behavior described here is similar to slow-moving glacial or permafrost features on Earth. The Debris Apron in this image also has several subtle "ridge" features on its surface from low Sun illumination. The Ridges are roughly parallel to the base of the hill and their shapes mimic one another along their lengths.
Similar Ridges are seen on other Debris Aprons in this Region where the Aprons are located directly below large piles of debris accumulating along the bottom of hillslopes. These observations have led to the hypothesis that Ridges on Debris Aprons are accumulated piles of debris from a period of abnormally high erosion. If this was indeed the case, each Ridge may indicate a change in the climate or local environment that would have implications for our overall understanding of the Martian Climate.MareKromium
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PSP_001398_2615_RED_abrowse.jpgExposure of NPLD with "Unconformities" (Natural - but enhanced - Colors; credits: Dr Paolo C. Fienga - Lunexit Team)81 visiteThis image shows a portion of the North Polar Layered Deposits (NPLD). The NPLD are layers that have been deposited over an extensive area at both Poles, possibly throughout Martian History. They likely contain ice-rich and dust-rich layers, with the darker layers being probably more dust-rich than the bright layers.
The NPLD holds clues to past climate regimes similar to ice cores on Earth. Several of the layers occur in fairly regular sequences, as seen in this image, suggesting that Mars underwent cyclic climate changes in the past.
Towards the top left side of the image, there is a series of layers that appears truncated at an angle, forming what geologists call "Angular Uncomformity". They typically form by first laying down a series of continuous beds. Then erosion cuts through the beds at an angle. Aferwards, a new set of beds are laid over this partially eroded sequence. A similar Unconformity exists at the bottom right of the image.MareKromium
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