| Piú votate - A Tribute To Mars Global Surveyor |
Craters-Terby_Crater-02.jpgThe Sedimentary Layers of Terby Crater (2 - Original NASA/MGS/MSSS b/w Frame)55 visitenessun commento
(3 voti)
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Craters-Unnamed_Crater_Field_in_Ares_Vallis-MGS.JPGSecondary Craters' Field in Ares Vallis (Original NASA/MGS/MSSS b/w Frame)57 visiteOriginal caption:"This MGS-MOC image shows a Field of Secondary Craters located on the Plains located North of Ares Vallis, roughly 30 or 35 Km (such as about 19–22 miles) North-East of the Mars Pathfinder LS. These Craters did not form directly by individual meteor impacts: they resulted from the impact of material ejected from a much larger meteor impact that might have occurred somewhere to the South of the Region".
Nota: per i professionisti di Scienze Planetarie, suggeriamo di portare il frame sino al full-size e quindi esaminare, campionando, almeno 10/12 crateri secondari agendo sull'intera area ripresa. Noi lo abbiamo fatto e le forme che abbiamo individuate NON supportano - a nostro parere - la caption NASA. In particolare: se questa zona è effettivamente ricoperta da crateri secondari, allora dovremmo ipotizzare, dopo aver valutato le diverse angolazioni dei rilievi, che questi ejecta sono arrivati da almeno 2 (se non 3) impatti diversi e sensibilmente distanziati nel tempo.
L.N.: 19.9° N and 33,3° W
(3 voti)
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Craters-Becquerel_Crater-Layers-00.jpgBeautiful Layers inside Becquerel Crater (Original NASA/MGS/MSSS b/w Frame)56 visiteOriginal caption:"This MGS-MOC image shows light-toned, layered, Sedimentary Rock Outcrops in Becquerel Crater , located in the Western Arabia Terra Region. The Crater may once have hosted a lake, into which these sediments were deposited. Although the fine, detailed layering in Becquerel was not known until the MGS-MOC first began to image these materials in 1999, the presence of a grossly-layered, light-toned feature was known from Viking orbiter images and was speculated from those data to possibly represent evidence for the presence of a former lake".
Location near: 21,5° North Lat. and 8,2° West Long.
Image width: ~3 Km (~1,9 mi)
Season: Northern Winter
(3 voti)
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Chaotic_Terrain-Eos_Chaos-02.jpgFeatures of Eos Chaos: High Slope (Original NASA/MGS/MSSS b/w Frame - 2)53 visiteLocation near: 12,9° South Lat. and 49,5° West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Southern Summer
(3 voti)
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Craters-Unnamed_Craters-Utopia_Planitia-00.jpgOld Buried Unnamed Craters in Northern Utopia Planitia (Original NASA/MGS/MSSS b/w Frame)53 visiteOriginal caption:"This MGS-MOC image shows 2 circular features on the Plains of Northern Utopia. A common sight on the Martian Northern Plains, these rings indicate the locations of Buried Impact Craters".
Location near: 65,1° North Lat. and 261,2° West Long.
Image width: ~2 Km (~1,2 mi)
Illumination from: lower left
Season: Northern Summer
(3 voti)
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Channels-Inverted_Channels_in_Arabia_Terra-PIA03643-00.jpgInverted channels of Arabia Terra (1 - Original NASA/MGS/MSSS b/w Frame)54 visiteOriginal caption:"This MGS-MOC image shows a somewhat sinuous, nearly flat-topped Ridge, located in Eastern Arabia Terra. The ridgetop was once the Floor of a Valley, perhaps carved by running water. The Valley Floor, or material that covered the Floor, was more resistant to erosion than the surrounding rock into which the Valley was cut. Thus, over time, the Valley disappeared and its Floor was left standing high as a Ridge. Inverted Valleys are common on Mars, but they also occur on Earth".
Location near: 10,8° North Lat. and 313,2° West Long.
Image width: width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Winter
(3 voti)
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South_Polar_Features-South_Polar_Cap-PIA04287.jpgThe South Pole of Mars (Original NASA/MGS/MSSS b/ Frame)53 visiteOn 8 September 2005 (UT), the MGS-MOC resumed imaging of Mars after a nearly 2-week hiatus to recover the spacecraft from a glitch that put MGS into a protective "safe mode". The MOC was turned on during MGS orbit 29053, while the spacecraft was flying across day side of the Planet. MOC then resumed taking pictures on the next orbit. Shown here is a portion of the first picture acquired following MOC turn-on. The image shows a view of the Martian South Polar Region, as it appeared on September 8, 2005. The image was taken by MOC's red wide angle camera. In this case, the spacecraft began imaging Mars as it passed across the southern terminator, at the bottom of the image. MGS then flew southward, over the Polar Cap, then northward toward the Equator. The Equatorial Region is further north than the area shown here. The equatorial region is further north than the area shown here. The image not only provided the MOC team a confirmation that MOC imaging has resumed, this particular image, in the map-projected form shown here, is being used by the team to assist in setting the exposures for MOC narrow angle camera images that will be acquired from the south polar region over the next several days.
(3 voti)
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Troughs-Tharsis_Region-PIA04103-000.jpgWhat's inside the Trough? (CTX Frame - Original NASA/MGS/MSSS b/w Frame)53 visiteCaption NASA originale:"This MGS-MOC image shows Channels carved by catastrophic Floods in the Tharsis Region of Mars. This area is located North/West of Jovis Tholus, and East of the large Martian Volcano Olympus Mons. The Terrain is presently mantled with fine Dust".
Location near: 10,5° North Lat. and 203,4° West Long.
Image width: width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Autumn
(3 voti)
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Craters-Rabe_Crater-I-M0203079-02.jpgThe "Pitted" West Floor of Rabe Crater (3) - EDM (Original NASA/MGS/MSSS b/w Frame)55 visitenessun commento
(3 voti)
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Craters-Rabe_Crater-I-M0203079-00.jpgThe "Pitted" West Floor of Rabe Crater - The Area (1) - (Original NASA/MGS/MSSS b/w Frame)54 visiteImage ID (picno): M02-03078
Image start time: 1999-06-22 - T04:56:09.09 SCET
Image width: 1024 pixels
Image height: 3200 pixels
Line integration time: 0,7231 millisec
Pixel aspect ratio: 1,60
Compression type: MOC-PRED-X-5
Longitude of image center: 326,11°W
Latitude of image center: 44,24°S
Scaled pixel width: 2,77 mt
Scaled image width: 2,85 Km
Scaled image height: 14,4 Km
Solar Longitude (Ls): 158,39°
Local True Solar Time: 14,80 decimal hours (such as--->14:48 MLT)
Emission angle: 0,26°
Incidence angle: 65,43°
Phase angle: 65,36°
North azimuth: 94,16°
Sun azimuth: 47,45°
Spacecraft altitude: 371,30 Km
Slant (--->inclinazione) distance: 371,30 Km
(3 voti)
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Clouds-Chasma_Australe-M0904026-01.jpgClouds over Chasma Australe (Original NASA/MGS/MSSS b/w Frame - EDM)53 visiteQuesta immagine è stata ottenuta dalla Sonda MGS quando si trovava ad un'altitudine di circa 370 Km; l'ora locale del rilievo ripreso segna le 16 circa, MLT.
(3 voti)
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Clouds-Chasma_Australe-M0904026-00.jpgClouds over Chasma Australe (Original NASA/MGS/MSSS b/w CTX Frame)57 visiteUn'altra immagine completamente enigmatica che, nel silenzio della NASA, proviamo ad interpretare. Chasma Australe è un profondissimo crepaccio (Chasm/a--->abisso) sul cui fondo, forse, si potrebbe trovare qualcosa (acqua allo stato liquido magari, in alcuni periodi dell'anno?). Se così effettivamente fosse, allora non sarebbe del tutto improponibile la circostanza per cui, al di sopra di questa zona così "umida", si sia potuta formare una spessa coltre di nuvole. In effetti, come potrete vedere nel detail mgnf che segue questo frame, è difficile vedere qualcosa di diverso dalle nuvole sul lato Dx dell'immagine e, quindi, proprio al di sopra dell'Abisso Australe. Certo, potremmo sbagliarci, ma questa interpretazione, dati alla mano, non è meno credibile di tante altre...
(3 voti)
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