| Ultimi arrivi - Mars Reconnaissance Orbiter (MRO) |
ESP_019599_1445_RED_abrowse-01.jpgBright Bedrock inside Hale Crater (Absolute Natural Colors; additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)69 visitenessun commentoMareKromiumDic 02, 2010
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ESP_019599_1445_RED_abrowse-00.jpgBright Bedrock inside Hale Crater (Absolute Natural Colors; additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)74 visitenessun commentoMareKromiumDic 02, 2010
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Dunes_and_DD_Tracks-PIA13538-PCF-LXTT-003.jpgSouthern Dunes and DD Tracks: the Anomaly (an Image-Mosaic by Dr Paolo C. Fienga - Lunexit Team)140 visiteChe il "Disco Nero" sia un oggetto reale o un (nuovo e bizzarro) image-artifact, molto probabilmente noi non verremo mai a saperlo; ma che la NASA, spesso e volentieri, faccia dei pasticci i quali - agli occhi degli Appassionati e a volte, anche degli Studiosi - ci fanno rabbrividire, lo sappiamo, ormai, da molto tempo.
Ma, per il momento, lasciamo perdere ogni "dietrologia" ed andiamo a vedere la questione in dettaglio: l'immagine con il "Disco Nero" (con l'Anomalìa, insomma) è il Prodotto NASA "Full-Res JPEG" da 1,1 MB, estratto dal "NASA - Planetary Photojournal" (laddove venne pubblicato in data 25 Ottobre 2010), contrassegnato dal seriale n. PIA13538 ed estratto, dice la NASA, dal Prodotto NASA "Hi-Rise" PSP_003695_1250 (un Prodotto al quale la NASA stessa fa rimando nella pagina dedicata al frame PIA13538).
Tuttavia, se si va a guardare il Prodotto Hi-Rise PSP_003695_1250, seguendo il link fornito dalla NASA (e che porta effettivamente al Prodotto Hi-Rise PSP_003695_1250) il Disco Nero non risulta visibile. Non c'è. E' "sparito".
Perchè?
Forse perchè abbiamo sbagliato qualcosa noi e, di conseguenza, abbiamo "frainteso" l'immagine?
O perchè l'Anomalia è, palesemente, un image-artifact creatosi durante la "trasformazione" del Prodotto PSP_003695_1250 in Prodotto PIA13538?
No.
L'Anomalìa "scompare" perchè, molto semplicemente, il Prodotto PIA13538 ed il Prodotto Hi-Rise PSP_003695_1250 NON SONO lo stesso prodotto!
L'angolo di Fase - che, Vi ricordiamo, è l'Angolo disegnato dal Sole, l'Oggetto Ripreso (ivi, il Suolo di Marte e l'Anomalìa) e la Sonda che lo riprende (ivi, il Mars Reconnaissance Orbiter) - è palesemente diverso, come il nostro mosaico dimostra - riteniamo - in maniera evidente ed inequivocabile.
Conclusioni: si tratta di un Cover-up venuto malissimo? Di un (mega)-pasticcio NASA? O di un semplice errore (ancorchè piuttosto grossolano)?
Questo, ovviamente, noi non lo sappiamo e non lo possiamo sapere. Però il nostro compito, che è quello di osservare, analizzare e riportare alla Vostra attenzione i dati disponibili in chiave "informativa e divulgativa", lo abbiamo svolto: bene ed al 100%.
E queste nostre considerazioni non sono "complottismo": esse sono semplice e pura Professionalità nell'adempimento delle nostre mansioni.
Una "professionalità" che anche la NASA (ma non solo), allorchè produce Informazione e Divulgazione, dovrebbe imparare ad usare: perchè i "grandi (se non "immensi") mezzi", da soli, non bastano!
Meditateci sopra e poi, se volete, scrivete qualche commento...MareKromiumNov 28, 2010
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PSP_004805_1710_RED_abrowse.jpgOn the Edge of Ganges Chasma (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)80 visiteThe Troughs and Chasms of the Valles Marineris Canyon System contain Light-Toned Deposits of enigmatic origin. The light materials, often layered, have variously been proposed to be Volcanic Ash or Sediments laid down by Rivers, Lakes or Sand Dunes.
One aspect of the Light-Toned material that has remained unclear is the timing of its deposition relative to canyon formation - was the material deposited in the Troughs, or does it crop out in the Walls, indicating that it existed before the Valles Marineris Canyon System formed?
This HiRISE image shows a part of the wall of Ganges Chasma. (This image, taken during the major Dust Storms which have raged through the summer of 2007, is grainy and low-contrast because of Dust in the Atmosphere). The Plateau above the Chasm is on the right side of the image, with the Wall of the Trough descending to the North. A few fine Layers, likely Basalt Flows, form the cap layers.
In the Spur, at the center of the image, light material appears to crop out, contrasting with the relatively dark material elsewhere in the Wall of the trough. At least some of this material is inherently lighter than other Wallrock; changes in tone occur at several sites where there are no breaks in Slope.
The light material appears be forming Spurs and Ridges similar to the surrounding rock, suggesting that it comprises at least some part of the Walls. However, darker, bouldery material occurs at the same level just to the West (up) of the light patch, indicating that the light outcrop may not extend very far.
Images like this provide clues to help unravel the history of deposition and deformation in Valles Marineris, and may eventually tell a complex story. In order to fully understand what this image means, several questions must be addressed: is this light material the same as intensively Layered Deposits observed elsewhere?
How extensive are light Wall Materials?
Are these materials conformable (part of a continuous sequence) with the rest of the Wall?
More HiRISE imaging will help address these questions. MareKromiumNov 27, 2010
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PSP_004804_1105_RED_abrowse.jpgGullies in Sisyphi Planum (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)72 visiteImage PSP_004804_1105 shows the Walls of a large Pit inside Lyell Crater, near the South Polar Region.
This image was acquired during a period of elevated Atmospheric Dust, following a series of Dust Storms that encircled the Planet; this is the cause of the longitudinal bands of contrasting gray levels in the image. We can still see through the thick Atmosphere, though, Gullies and other subtle features which could have been produced by water and ice present at or near the Surface.
The otherwise subdued Surface in this Region is criss-crossed by numerous fissures, forming Polygons some 10 mt (9 yards) across. Similar features in both shape and scale can be found in terrestrial Periglacial Regions such as Antarctica, where ice is present at or near the Surface. Antarctica's features are the product of repeated expansion and contraction of the soil-ice mixture due to seasonal temperature oscillations. This results in Polygonal Networks of Stress Fractures. MareKromiumNov 27, 2010
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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) 111 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. MareKromiumNov 27, 2010
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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) 87 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.MareKromiumNov 27, 2010
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PSP_005069_1670_RED_abrowse-00.jpgExposed Faults and Gravity Wasting Evidence in Coprates Chasma (CTX Frame - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)111 visitenessun commentoMareKromiumNov 26, 2010
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PSP_005069_1670_RED_abrowse-01.jpgExposed Faults and Gravity Wasting Evidence in Coprates Chasma (EDM - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)100 visitenessun commentoMareKromiumNov 26, 2010
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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)103 visitenessun commentoMareKromiumNov 26, 2010
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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)94 visitenessun commentoMareKromiumNov 26, 2010
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ESP_019711_2455_RED_abrowse.jpgUnnamed Crater in Vastitas Borealis (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)94 visiteThis image covers part of a large Impact Crater located in the Northern Plains of Mars (Vastitas Borealis Region). The Crater is old and has been heavily modified by ground ice processes. The most prominent of these processes is the network of Polygonal Fractures visible throughout the image.
These landforms are created when temperature changes over the course of a year cause ice in the ground to first expand, then contract and, in the end, break. The ground moves fractionally every time this occurs.
At the center of the frame it can be seen that this - repetitive - process has caused the shifting of rocks and boulders through the Surface of the Crater, thus causing them to line up along the Fractures and then form some interesting geometric patterns.MareKromiumNov 26, 2010
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