Mars Reconnaissance Orbiter (MRO)
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PSP_009708_1770_red-PCF-LXTT-1.jpgSouthern Meridiani Planum (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)184 visitenessun commentoMareKromium
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PSP_009708_2205_RED_abrowse-00.jpgHills in Acidalia Planitia (CTX Frame - Enhanced and Darkened Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)54 visiteThe hilly landscape visible in this observation may appear at first rather bleak, due to the pervasive soils of uniform brightness blanketing most of the area.
However, upon closer examination, the image reveals rocky outcrops at the top of some of the hills.
These rocks contain clues pointing to a watery past.MareKromium
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PSP_009708_2205_RED_abrowse-01.jpgHills in Acidalia Planitia (EDM - Enhanced Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)54 visiteThis edm frame (375x250 meters, or 410x273 yards) of the HiRISE depicts in detail the rocky layers existing in one of these hills.
CRISM, another of the instruments onboard Mars Reconnaissance Orbiter, has acquired data over this same region showing that the rocky outcrops contain clays. Clays of similar composition form in terrestrial environments favorable for life, where volcanic rocks are in close contact with water.MareKromium
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PSP_009709_2155_red-PCF-LXTT-1.jpgMesa in Acidalia Planitia Region (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)203 visiteMars Local Time: 15:22 (early afternoon)
Coord. (centered): 35,3° North Lat. and 322,3° East Long.
Spacecraft altitude: 293,7 Km (such as about 183,5 miles)
Original image scale range: 29,4 cm/pixel (with 1 x 1 binning) so objects ~ 58,8 cm across are resolved (with 2 x 2 binning)
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,3°
Phase Angle: 45,7°
Solar Incidence Angle: 46° (meaning that the Sun is about 44° above the Local Horizon)
Solar Longitude: 116,1° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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PSP_009710_2590_RED.jpgRelatively Fresh Ice-Patch near the North Polar Layered Deposits (possible True Colors; credits: Lunar Explorer Italia)55 visiteMars Local Time: 14:57 (early afternoon)
Coord. (centered): 78,7° North Lat. and 285,2° East Long.
Spacecraft altitude: 323,6 Km (such as about 202,2 miles)
Original image scale range: 32,4 cm/pixel (with 1 x 1 binning) so objects ~97 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 11,8°
Phase Angle: 50,0°
Solar Incidence Angle: 60° (meaning that the Sun is about 30° above the Local Horizon)
Solar Longitude: 116,1° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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PSP_009712_1785_RED.jpgPit-Chain in South-Western Pavonis Mons (possible True Colors; credits: Lunar Explorer Italia)54 visiteMars Local Time: 15:30 (middle afternoon)
Coord. (centered): 1,4° South Lat. and 245,1° East Long.
Spacecraft altitude: 254,6 Km (such as about 159,1 miles)
Original image scale range: 50,9 cm/pixel (with 1 x 1 binning) so objects ~1,53 mt across are resolved
Map projected scale: 50 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,5°
Phase Angle: 56,9°
Solar Incidence Angle: 56° (meaning that the Sun is about 34° above the Local Horizon)
Solar Longitude: 116,2° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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PSP_009713_2415_RED.jpgVastitas' Rocky Terrain (possible True Colors; credits: Lunar Explorer Italia)55 visiteMars Local Time: 15:10 (early afternoon)
Coord. (centered): 61,4° North Lat. and 208,0° East Long.
Spacecraft altitude: 310,1 Km (such as about 193,8 miles)
Original image scale range: 31,0 cm/pixel (with 1 x 1 binning) so objects ~93 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,3°
Phase Angle: 50,8°
Solar Incidence Angle: 51° (meaning that the Sun is about 39° above the Local Horizon)
Solar Longitude: 116,2° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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PSP_009714_1725_RED.jpgPeriequatorial Surface Sample (natural colors; credits: Lunar Explorer Italia)54 visiteMars Local Time: 15:31 (middle afternoon)
Coord. (centered): 7,5° South Lat. and 191,3° East Long.
Spacecraft altitude: 265,0 Km (such as about 165,6 miles)
Original image scale range: 26,5 cm/pixel (with 1 x 1 binning) so objects ~80 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,1°
Phase Angle: 59,8°
Solar Incidence Angle: 60° (meaning that the Sun is about 30° above the Local Horizon)
Solar Longitude: 116,2° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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PSP_009725_2485_RED.jpgPhoenix Landing Site (possible True Colors; credits: Lunar Explorer Italia)130 visiteMars Local Time: 14:48 (early afternoon)
Coord. (centered): 68,2° North Lat. and 234,3° East Long.
Spacecraft altitude: 324,1 Km (such as about 202,6 miles)
Original image scale range: 32,4 cm/pixel (with 1 x 1 binning) so objects ~97 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 15,6°
Phase Angle: 66,9°
Solar Incidence Angle: 53° (meaning that the Sun is about 37° above the Local Horizon)
Solar Longitude: 116,6° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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PSP_009739_2580_RED.JPGLinear Dunes in the North Polar Region (possible natural colors; credits: Lunexit)54 visiteThis observation shows linear dunes in the north polar region of Mars. Linear or longitudinal sand dunes are elongated, sharp crested ridges that are typically separated by a sand–free surrounding surface.
These features form from bi-directional winds and extend parallel to the net wind direction. In this case, the net wind direction appears to be from the west-southwest. Linear sand dunes are found in many different locations on Earth and commonly occur in long parallel chains with regular spacing.
Superimposed on the surface of the linear dunes are smaller secondary dunes or ripples. This is commonly observed on terrestrial dunes of this size as well. Polygons formed by networks of cracks cover the substrate between the linear dunes and may indicate that ice-rich permafrost (permanently frozen ground) is present or has been present geologically recently in this location.MareKromium
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PSP_009739_2580_RED_abrowse-2.jpgResidual Ice (edm - natural colors; credits: Lunexit)54 visiteIl dettaglio, palese tanto nella versione in b/n del frame, quanto in quella a colori naturali, è stato individuato dal bravissimo Dr Barca e, inizialmente, ci ha fatto pensare ad una possibile estrusione d'acqua la quale, poco dopo essere stata "espulsa", si è rapidamente congelata.
Ma sbagliavamo, poichè non si tratta, a nostro parere, del residuo di un fenomeno estrusivo.
Non lo è, perchè le estrusioni d'acqua (e fango) si manifestano - di solito, e "visivamente" - con accumuli caotici di blocchi di ghiaccio sporco di varie dimensioni intorno ad un'area di ghiaccio più limpido la quale è compatta e posizionata centralmente rispetto agli altri blocchi e blocchetti (provate a visualizzare, per capire bene, la conseguenza di uno "spruzzo" - tipo geyser - di acqua e fango, con l'acqua che poi gela rapidamente).
In Islanda, se volete, si può vedere qualcosa di simile.
Nel nostro caso di specie, comunque, si può dire che la posizione del dettaglio in oggetto è indicativa di un'area su cui si trova del semplice ghiaccio "sporco" (ghiaccio d'acqua, a giudicare dall'albedo e dal colore) residuale, sfuggito al disgelo grazie alla protezione offertagli dalla duna che lo sovrasta.
La configurazione delle dune che caratterizzano la zona, inoltre, ci dice che l'area gelata è posizionata su una superficie decisamente più bassa rispetto al Datum medio della regione, e quindi con niente (o poco) Sole che scioglie e niente (o poco) vento che "gratta & smuove".
Un accumulo di ghiaccio, quindi, destinato a "sopravvivere" MOLTO a lungo!...MareKromium
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PSP_009749_1995_RED.jpgFresh "Santa Fe Crater" in Chryse Planitia (possible True Colors; credits: Lunar Explorer Italia)55 visiteMars Local Time: 15:25 (early afternoon)
Coord. (centered): 19,4° North Lat. and 312,0° East Long.
Spacecraft altitude: 283,4 Km (such as about 177,1 miles)
Original image scale range: 28,4 cm/pixel (with 1 x 1 binning) so objects ~85 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 4,0°
Phase Angle: 51,6°
Solar Incidence Angle: 48° (meaning that the Sun is about 42° above the Local Horizon)
Solar Longitude: 117,5° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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