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Thaumasia_Region-The_Electric_Dunes-03.jpgThaumasia Dunes: the brightest dunes of Mars (EDM n.2)89 visiteDa questa immagine, la luminosità di queste "dune" appare davvero in maniera inequivocabile. La prudenza, come sapete, non è mai troppa, ma la nostra sensazione è che stiamo guardando del ghiaccio o del metallo. L'immagine è stata ottenuta da un'altezza di 370 Km e sono le 14:48 MLT (cioè l'ora locale del luogo ripreso). Il Sole, a quell'ora, è decisamente alto sull'orizzonte e quindi la possibilità che l'albedo elevatissima di queste strutture dipenda proprio da un fenomeno di riflessione diretta della luce solare ci sembra, tutto sommato, accettabile.
Ciò che non ci sembra accettabile è l'atteggiamento della NASA riguardo a questo e ad altri fenomeni similari (ed eclatanti): un atteggiamento di TOTALE INDIFFERENZA.
Ma questa, come sapete, è tutta un'altra storia...04/01/11 at 08:34andreagg: Stando a quanto detto dalla Nasa, non si trovano u...
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Thaumasia_Region-The_Electric_Dunes-03.jpgThaumasia Dunes: the brightest dunes of Mars (EDM n.2)89 visiteDa questa immagine, la luminosità di queste "dune" appare davvero in maniera inequivocabile. La prudenza, come sapete, non è mai troppa, ma la nostra sensazione è che stiamo guardando del ghiaccio o del metallo. L'immagine è stata ottenuta da un'altezza di 370 Km e sono le 14:48 MLT (cioè l'ora locale del luogo ripreso). Il Sole, a quell'ora, è decisamente alto sull'orizzonte e quindi la possibilità che l'albedo elevatissima di queste strutture dipenda proprio da un fenomeno di riflessione diretta della luce solare ci sembra, tutto sommato, accettabile.
Ciò che non ci sembra accettabile è l'atteggiamento della NASA riguardo a questo e ad altri fenomeni similari (ed eclatanti): un atteggiamento di TOTALE INDIFFERENZA.
Ma questa, come sapete, è tutta un'altra storia...03/31/11 at 20:10MareKromium: ...io ancora aspetto commenti "pesanti" ...
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Craters-Unnamed_Fresh_Crater_in_Noctis_Labyrinthus-MGS.jpgFresh Crater (Original NASA/MGS/MSSS b/w Frame)56 visiteCaption NASA originale:"This MGS-MOC image shows a relatively Fresh Crater with dark, rayed Ejecta on an upland plain above one of the many depressions in the Eastern Labyrinthus Noctis Region. The presence of the dark rays emanating from the Crater suggests that the impact was a relatively recent event compared to other Craters of similar diameter in the scene. Over time, the dark Ejecta will fade and blend in with its surroundings, owing to settling of Dust from the Atmosphere".
Location near: 9,7° South Lat. and 94,8° West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: upper left
Season: Southern Summer02/13/11 at 17:41MareKromium: Ecco un esempio di craterino "fresco" co...
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South_Polar_Regions-PIA04162.jpgDefrosting South Polar Region (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)114 visiteOriginal caption:"This MGS-MOC image shows varied springtime patterns formed in defrosting, seasonal carbon dioxide frost in the South Polar Region of Mars. The feature sporting an outline of dark spots and an interior of smaller, closely-spaced dark spots and dark-outlined polygons is a patch of windblown or wind-eroded sand that was covered by carbon dioxide frost during the previous autumn and winter. The fainter, larger polygon pattern on either side of the patch of defrosting sand is formed in the substrate upon which the sand patch is sitting. Polygonal forms such as these might indicate the presence of ice below the surface".
Location near: 79,6°S; 125,0°W
Image width: width: ~3 Km (~1,9 mi)
Illumination from: upper left
Season: Southern SpringMareKromium11/28/10 at 13:03MareKromium: Grazie Giorgio. La stratigrafia corretta dovrebbe ...
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South_Polar_Regions-PIA04162.jpgDefrosting South Polar Region (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)114 visiteOriginal caption:"This MGS-MOC image shows varied springtime patterns formed in defrosting, seasonal carbon dioxide frost in the South Polar Region of Mars. The feature sporting an outline of dark spots and an interior of smaller, closely-spaced dark spots and dark-outlined polygons is a patch of windblown or wind-eroded sand that was covered by carbon dioxide frost during the previous autumn and winter. The fainter, larger polygon pattern on either side of the patch of defrosting sand is formed in the substrate upon which the sand patch is sitting. Polygonal forms such as these might indicate the presence of ice below the surface".
Location near: 79,6°S; 125,0°W
Image width: width: ~3 Km (~1,9 mi)
Illumination from: upper left
Season: Southern SpringMareKromium11/28/10 at 10:23george_p: Molto Suggestivo, mi sembra di capire che il ghiac...
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South_Polar_Regions-PIA03007.jpgDefrosting South Polar Region (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)110 visiteDefrosting Southern Regions
Original caption:"This MGS-MOC image shows a second view of varied Springtime defrosting patterns formed in a dune field and surrounding polygon-patterned ground in the South Polar Region of Mars. (...) The feature sporting an outline of dark spots and an interior of smaller, closely-spaced dark spots and dark-outlined polygons is a patch of windblown or wind-eroded sand that was covered by carbon dioxide frost during the previous Autumn and Winter. The fainter, larger polygon pattern on either side of the patch of defrosting sand is formed in the substrate upon which the sand patch is sitting. Polygonal forms such as these might indicate the presence of ice below the surface".
Location near: 79,9°S; 125,9°W
Image width: width: ~3 Km (~1,9 mi)
Illumination from: upper left
Season: Southern SpringMareKromium11/25/10 at 11:11MareKromium: No, Caro Andrea, questi no. I fenomeni di criovulc...
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South_Polar_Regions-PIA03007.jpgDefrosting South Polar Region (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)110 visiteDefrosting Southern Regions
Original caption:"This MGS-MOC image shows a second view of varied Springtime defrosting patterns formed in a dune field and surrounding polygon-patterned ground in the South Polar Region of Mars. (...) The feature sporting an outline of dark spots and an interior of smaller, closely-spaced dark spots and dark-outlined polygons is a patch of windblown or wind-eroded sand that was covered by carbon dioxide frost during the previous Autumn and Winter. The fainter, larger polygon pattern on either side of the patch of defrosting sand is formed in the substrate upon which the sand patch is sitting. Polygonal forms such as these might indicate the presence of ice below the surface".
Location near: 79,9°S; 125,9°W
Image width: width: ~3 Km (~1,9 mi)
Illumination from: upper left
Season: Southern SpringMareKromium11/24/10 at 22:18andreagg: So che sono effluvi di gas... CO mi sembra di rico...
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Volcanoes-Pavonis_Mons-PCF-LXTT.jpgPavonis Mons (Enhanced and Saturated Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)86 visiteCaption NASA originale:"This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) wide angle color composite image, obtained in December 2003, shows the middle of the three Tharsis Montes, Pavonis Mons.
This is a broad shield volcano - similar to the volcanoes of Hawaii - located on the Martian Equator at approx. 113° West. The Volcano Summit is near 14 Km (~8,7 mi) above the Martian Datum (such as 0 elevation); the central caldera (crater near center of image) is about 45 Km (~28 mi.) across and about 4,5 Km (~2.8 mi.) deep. Sunlight illuminates the scene from the lower left". MareKromium08/08/10 at 17:20MareKromium: Un esempio del re-processing dei vecchi frames MGS...
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Dunes-S2200554sub-00.jpgMigrating Dunes (Original NASA/MGS/MSSS b/w Frame)108 visiteCaption NASA originale:"This MGS-MOC image shows a suite of dunes in one of the several North Polar Dune Fields. The bright surfaces adjacent to some of the dunes are patches of frost. These dunes spend much of the Autumn, Winter, and Spring seasons covered with CO2 frost. Only in late Spring and in Summer are the dark windblown sands fully exposed.
Over the course of the 9+ years of the MGS mission, the MOC team has sought evidence that sand dunes may be migrating downwind over time. However, no clear examples of the movement of a whole dune have been identified. On Earth, such movement is typically detectable in air photos of the smallest active dunes over periods of a few years. Owing to the fact that the North Polar Dunes spend much of each Martian Year under a cover of frost, perhaps these move much more slowly than their frost-free, terrestrial counterparts. The sand may also be somewhat cemented by ice or minerals, likewise preventing vigorous dune migration in the present environment.
This view covers an area approximately 3 km (1.9 mi) wide and is illuminated by sunlight from the lower left. The dunes are located near 79.8°N, 127.1°W, and the picture was acquired on 11 September 2006.
07/26/10 at 22:34MareKromium: La finezza della NASA è nell'uso della parola &q...
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Dunes-S2200554sub-00.jpgMigrating Dunes (Original NASA/MGS/MSSS b/w Frame)108 visiteCaption NASA originale:"This MGS-MOC image shows a suite of dunes in one of the several North Polar Dune Fields. The bright surfaces adjacent to some of the dunes are patches of frost. These dunes spend much of the Autumn, Winter, and Spring seasons covered with CO2 frost. Only in late Spring and in Summer are the dark windblown sands fully exposed.
Over the course of the 9+ years of the MGS mission, the MOC team has sought evidence that sand dunes may be migrating downwind over time. However, no clear examples of the movement of a whole dune have been identified. On Earth, such movement is typically detectable in air photos of the smallest active dunes over periods of a few years. Owing to the fact that the North Polar Dunes spend much of each Martian Year under a cover of frost, perhaps these move much more slowly than their frost-free, terrestrial counterparts. The sand may also be somewhat cemented by ice or minerals, likewise preventing vigorous dune migration in the present environment.
This view covers an area approximately 3 km (1.9 mi) wide and is illuminated by sunlight from the lower left. The dunes are located near 79.8°N, 127.1°W, and the picture was acquired on 11 September 2006.
07/26/10 at 20:24andreagg: Grazie mille! Comunque la frase "However, no ...
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Dunes-S2200554sub-00.jpgMigrating Dunes (Original NASA/MGS/MSSS b/w Frame)108 visiteCaption NASA originale:"This MGS-MOC image shows a suite of dunes in one of the several North Polar Dune Fields. The bright surfaces adjacent to some of the dunes are patches of frost. These dunes spend much of the Autumn, Winter, and Spring seasons covered with CO2 frost. Only in late Spring and in Summer are the dark windblown sands fully exposed.
Over the course of the 9+ years of the MGS mission, the MOC team has sought evidence that sand dunes may be migrating downwind over time. However, no clear examples of the movement of a whole dune have been identified. On Earth, such movement is typically detectable in air photos of the smallest active dunes over periods of a few years. Owing to the fact that the North Polar Dunes spend much of each Martian Year under a cover of frost, perhaps these move much more slowly than their frost-free, terrestrial counterparts. The sand may also be somewhat cemented by ice or minerals, likewise preventing vigorous dune migration in the present environment.
This view covers an area approximately 3 km (1.9 mi) wide and is illuminated by sunlight from the lower left. The dunes are located near 79.8°N, 127.1°W, and the picture was acquired on 11 September 2006.
07/26/10 at 13:31MareKromium: Esempio di Dune Migranti, per Andrea. Se vuoi una ...
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Volcanoes-Ceraunius_Tholus-MGS.jpgCeraunius, from atop (possible Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)70 visitenessun commentoMareKromium04/09/10 at 15:55MareKromium: Già...con ben visibili Patere, Caldere, Colate e Con...
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