| Piú votate - Mars Reconnaissance Orbiter (MRO) |
Craters-Holden_Crater-TRA_000861_1530_RED_Holden_Delta_01.jpgDetails of the beautiful White Cliffs of Holden Crater (Natural Colors credits: Lunar Explorer Italia)54 visitenessun commentoMareKromium
(8 voti)
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PSP_010412_2475_RED_abrowse.jpgUnnamed Crater with DD Tracks (Natural Colors; credits: Lunar Explorer Italia)54 visitenessun commentoMareKromium
(8 voti)
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Psp_010434_1575_red.jpgFan at Valley Mouth (possible True Colors; credits: Lunar Explorer Italia)53 visiteThis image shows the intersection of a Valley with the floor of a large Impact Crater. The Valley appears to have transported sediment that was deposited on the Crater Floor when the flow slowed. As the Eastern side of the lobate deposit appears to have been sheared off, it is possible that continuing flow from the valley eroded into its own deposits.
The deposit is noticeably different in color from the crater floor, indicating that the Valley transported different sediments. Since the large crater is shallow, likely due to infilling, this suggests that multiple sources of sediment and perhaps multiple deposition processes have affected the geology at this site.
The deposited material in the lobe at the Valley Mouth displays some interesting textural features. Small boulders are commonly present on its surface. This may demonstrate relatively energetic deposition as in a flash flood, although it is possible that the boulders are superimposed debris from later impact craters.
The Southern End of the deposit is also fracturing into blocks or slabs. These could be relics of old mud cracks, or of thermal contraction cracks formed in Permafrost.
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Mars Local Time: 15:42 (middle afternoon)
Coord. (centered): 22,4° South Lat. and 336,3° East Long.
Spacecraft altitude: 259,3 Km (such as about 162,1 miles)
Original image scale range: 25,9 cm/pixel (with 1 x 1 binning) so objects ~78 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 2,6°
Phase Angle: 68,2°
Solar Incidence Angle: 66° (meaning that the Sun is about 24° above the Local Horizon)
Solar Longitude: 143,2° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
(8 voti)
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PSP_008234_2405_red-PCF-LXTT.jpgPeriglacial Landscape in Northern Tempe Terra (Enhanced Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)53 visitenessun commentoMareKromium
(8 voti)
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PSP_006952_1870_RED_abrowse-00~0.jpgDunefield in West Arabia Terra Unnamed Crater (context frame; MULTISPECTRUM - credits: Lunexit)70 visiteThis image shows dunes in an unnamed crater in the West Arabia Terra region.
The rim of the crater lies to the South of the image (Sx) and a dark, toned field of barchan sand dunes rests on the crater floor in the Northern portion of the observation (Dx). MareKromium
(8 voti)
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PSP_008311_1835_RED_abrowse-00.jpgFeatures and Mineralogy of Aram Chaos (context-frame - MULTISPECTRUM; credits: Lunexit)106 visiteThis image is from Aram Chaos, a large crater connected to the Ares Vallis Outflow Channel. It is called “chaos” because of the rough floor topography, large slumped blocks and large fractures that may have been caused by removal of subsurface material.MareKromium
(8 voti)
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PSP_005571_0950_RED_abrowse-01.jpgSouth Polar Residual Cap Margin (extra-detail mgnf; MULTISPECTRUM - elab. Lunexit)53 visiteIn this extra-detail mgnf one can see fractures in the Residual Cap ice near the margin and, farther in, circular depressions that, in some places, appear to have coalesced.
These depressions constitute what is called "Swiss Cheese Terrain" and it's fairly easy to see why. The Swiss cheese terrain is created when the CO2 goes directly from the solid state (ice) to a gaseous state (the more familiar CO2 gas) as temperatures warm during South Polar Summer.
Swiss Cheese Formation may also be linked in a complicated way to the behavior of major Martian Dust Storms.
Images like these, taken before and after dust storm events, can aid our understanding of that complicated relationship.MareKromium
(8 voti)
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PSP_003222_1565_RED_browse.jpgProposed MSL Site in Eberswalde Crater53 visitenessun commentoMareKromium
(8 voti)
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Psp_001497_2480_red-00.jpgThe Northern Lakes: Lake "Ginny" (CTX Frame - False Colors)53 visiteQuando si sa dove guardare e che cosa cercare...Si finisce SEMPRE (o quasi...) con il trovare.
L'albedo del dettaglio che vedete in basso alla Vostra Dx è inconfondibile. Il detail-mgnf che abbiamo operato (e che vedrete nel prossimo quadro) è chiarissimo: c'è un nuovo Lago nelle Grandi Pianure Nordiche di Marte!
"Lake Ginny", questa volta (sempre con buona pace di IAU, NASA, ESA e di tutti gli altri Fenomeni che guardano, guardano, guardano...etc.).MareKromium
(8 voti)
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Psp_001401_1850_red-1.jpgThe "Bridges" of Arabia Terra (1) extra-detail mgnf75 visiteUn detail-mgnf che ci mostra con sconcertante chiarezza l'impossibilità che questi rilievi sìano il prodotto di azioni eoliche (anche complesse).
Alcuni Ricercatori suggeriscono un'origine artificiale per questi "ponti!" (o "tubi"); noi supponiamo, invece, una loro origine naturale, ma da investigarsi in un'ottica non geologica (o almeno NON SOLO geologica).
(8 voti)
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Northern_Plains-Psp_001380_2520_red-00.jpgAnother "Frozen Lake" in the Northern Plains? (1 - CTX Frame - False Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)54 visitenessun commentoMareKromium
(8 voti)
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Hesperia_Planitia-TRA_000882_1595_RED-01.jpg"Fresh" Crater and unusual surface details in Hesperia Planitia (EDM - Extremely Enhanced and Saturated Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)55 visiteIl rilievo la cui albedo è tale da renderlo visibile anche in un'area ombreggiata (Sx del frame) non è risolvibile e, purtroppo, rimane inesplicabile; il rilievo posto a Dx, invece, lo risolviamo, applicando un ultra-detail mgnf, in un "boulder colonnare" (una surface feature spettacolare e molto rara, ma non necessariamente una Surface Anomaly in senso tecnico.
Semmai, ci domandiamo "da dove" possa provenire il boulder colonnare in oggetto e la nostra ipotesi è che potrebbe trattarsi di un ejecta.
(8 voti)
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