Mars Reconnaissance Orbiter (MRO)
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PSP_004026_1765-3-GB-PCF-LXTT.jpgVery strange "Dark Spot" in Aureum Chaos (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)148 visiteAll'interno di questo canalone - uno dei tanti che si trovano nella Regione peri-Equatoriale conosciuta come Aureum Chaos (situata ad approx. 4° di Lat. Sud ed approx. 334° di Long. Est) -, assieme alle solite "ripples" (dunette), ho scorto una chiazza scura (che è emersa di un denso color nero, a seguito del processing Multispettrale da me abitualmente usato) la quale mi ha lasciato perplesso.
In attesa di esaminare il dettaglio in formato JP2, posso comunque dire che POTREBBE trattarsi di un'area infossata la quale si è, nel tempo, riempita di polveri sottilissime (tipo il nostro "particolato").
Polveri che, come sapete bene, se osservate a risoluzione modesta, appaiono come una (appunto) "chiazza scura" che ha, vagamente, le sembianze di un laghetto (o meglio: di una sorta di palude...).
Ritengo di poter ESCLUDERE l'eventualità per cui si tratti di una semplice ombra e mi piace considerare l'ipotesi (vista la curiosa - ma, a mio parere, davvero FORTISSIMA - somiglianza fra questa "chiazza nera" e le "chiazze nere" presenti sulla butterata Superficie della Luna Saturniana Iperione - Hyperion) per cui si possa trattare di un autentico affioramento di idrocarburi (surfacing hydrocarbons). Un "laghetto di petrolio" (o di sabbie intrise di petrolio), insomma...
Un'eventualità, quest'ultima, da me già ipotizzata (non solo per Iperione e Titano, ma anche per il Pianeta Rosso) da qualche anno e, al momento, non confermata nè smentita dalla NASA (sempre e solo per quanto attinente Marte).
Le Vostre opinioni saranno, come sempre, apprezzate.
Dr Paolo C. Fienga - Lunar Explorer ItaliaMareKromium
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PSP_004026_1765_RED_abrowse-10-MF-PCF-LXTT.jpgVery strange "Dark Spot" in Aureum Chaos (EDM - RAW Natural Colors; credits for the additional process. and color.: Drr Marco Faccin and Paolo C. Fienga - Lunexit Team) 68 visitenessun commentoMareKromium
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PSP_004030_1855_RED_browse.jpgBlast from the (Very Recent) Past54 visiteIn the center of this image is a very sharp-rimmed impact crater just 35 mt wide.
It lies in a bright, dust-covered region, but is surrounded by a slightly darker spot about 3 Km wide. The impact event created a blast of high winds that disturbed the dust and darkened the spot.
Since dust is constantly settling over the Region, the fact that we can still see the dark region means the impact event occurred of late, perhaps in recent decades. There are many dark streaks on topographic slopes over an even wider region surrounding the dark spot - these could be due to dust avalanches triggered by the impact, either from the air blast or from seismic shaking of the ground.
There are also rays of very small (approx. 1 mt in diameter) secondary craters extending radially outward from the 35-mt crater, created by the impact of rocks ejected from the main crater.
Thus a small impact crater has modified the surface over an area more then 10.000 times greater than that of the crater's interior.MareKromium
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PSP_004038_1255_RED_abrowse.jpgDunes inside Russel Crater (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)58 visiteThe Russell Crater Dunefield is covered seasonally by Carbon Dioxide (CO2) Frost, and this image shows the Dunefield after the Frost has sublimated (evaporated directly from solid to gas). There are just a few patches left of the bright seasonal frost.
Numerous dark DD Tracks can be seen meandering across the Dunes. The face of the largest dune is lined with Gullies. The source of the Gullies is unclear but could involve erosion by the seasonal CO2 Ice. MareKromium
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PSP_004046_2080_RED_browse-PCF-LXTT.jpgFeatures of Elysium Fossae (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team:)112 visitenessun commentoMareKromium
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PSP_004052_2045_RED_abrowse-00.jpgUnnamed Crater with Layers near Mawrth Vallis (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)88 visitenessun commentoMareKromium
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PSP_004052_2045_RED_abrowse-01.jpgUnnamed Crater with Layers near Mawrth Vallis (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)102 visitenessun commentoMareKromium
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PSP_004052_2045_RED_abrowse-02-PIA13726.jpgUnnamed Crater with Layers near Mawrth Vallis (Enhanced Natural Colors; credits: NASA/JPL-Caltech/University of Arizona)111 visiteThis image covers part of an Unnamed Impact Crater roughly 4 Km (approx. 2,5 miles) in diameter; the upper portion of the picture shows a one Km segment of the Crater's Inner Wall and Rim.
The Surface outside the Crater is relatively dark, while the Inner Wall of the Crater exposes lighter, Layered Bedrock of diverse colors. A few dark patches on the Crater Wall have small Dunes or Ripples on their surfaces, and are likely Pits filled with Dark Sand. This Crater provides a window into the Sub-Surface of Mars, revealing Layered Sedimentary Deposits.
Just about 30 Km (approx. 18,6 miles) to the East of this Crater lies Mawrth Vallis, an ancient Channel that may have been carved by catastrophic Floods.
In Layered Deposits surrounding Mawrth Vallis, the orbiting spectrometers OMEGA (on Mars Express) and CRISM (on MRO) have detected Phyllosilicate (such as Clay) minerals, which must have formed in the presence of water.
In this Region on Mars, the colors of the Layers seen by HiRISE often correlate with distinct water-bearing minerals observed by CRISM, so the color diversity seen here may reflect a dynamic environment at this location on early Mars.
Note: the color in these images is enhanced; it is not as it would normally appear to the human eye.MareKromium
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PSP_004056_1735_RED_browse.jpgJumbled Terrain (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)82 visitenessun commentoMareKromium
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PSP_004060_1440_RED_abrowse-00.jpgUnnamed Southern Crater with deep Gullies (CTX Frame - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)102 visitenessun commentoMareKromium
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PSP_004060_1440_RED_abrowse-01-PIA13611.jpgUnnamed Southern Crater with deep Gullies (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)91 visitenessun commentoMareKromium
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PSP_004071_1425_RED_abrowse.jpgMesas in Gorgonum Chaos (CTX Frame - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 87 visitePSP_004071_1425 shows Mesas that are part of Gorgonum Chaos, a Region of Chaotic Terrain, which is a jumble of Mounds and Mesas grouped together. Chaotic Terrain is most commonly found in Mars near the sources of the gigantic Outflow Channels. Gorgonum Chaos is one of the few exceptions.
Some of the Troughs between the Mesas appear to have V-shaped bottoms; there is no obvious flat floor in between. Others have Dunes running down their centers probably indicating flat floors.
It is possible that the Mesas were once connected and that something caused fractures in the original Mesa's Surface that were then preferentially eroded.MareKromium
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