| Piú viste - A Tribute To Mars Global Surveyor |
Craters-Unnamed_Craters_with_Sedimentary_Rock_Outcrops-PIA07127-01.jpgSedimentary Rocks (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)155 visiteCaption NASA originale:"Burial and Exhumation of Impact Craters, and their destruction by erosion, are common and repeated themes all over the Surface of Mars. Many Craters in Western Arabia Terra exhibit light-toned, Layered Outcrops of ancient Sedimentary Rock. Like the Sedimentary Rocks explored further to the South in Meridiani Planum by the Opportunity Mars Exploration Rover (MER-B), these "Intracrater Sedimentary Rocks" may have been deposited in water. This MGS-MOC image shows an example of light-toned Sedimentary Rocks outcropping in an Unnamed Crater that is much farther North than most of the similar examples in Western Arabia Terra. This one is located near 36,6° North Lat. and 1,4° West Long. and shows several old Impact Craters in various states of erosion and exhumation from beneath and within the Sedimentary Rock Materials. The image covers an area of approx. 3 Km".
MareKromium
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Dunes-Noachis_Terra-01.jpgDark Dunes in Noachis Terra (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)154 visiteCaption originale:"This MGS-MOC image shows Dark Sand Dunes and relatively small, light-toned, windblown Ripples on the Floor of an Unnamed Crater located in central Noachis Terra".
Location near: 50,0° South Lat. and 353,7° West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: upper left
Season: Southern AutumnMareKromium
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Channels-Bahram_Vallis-Landslide-M1000913-01.jpgLandslide in Bahram Vallis (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)154 visiteMareKromium
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Hills-Utopia_Planitia-PCF-LXTT.jpgBouldery Hill in Utopia Planitia (Natural Colors; credits for the additional process. and color: Dr Paolo C. Fienga - Lunexit Team)153 visiteCaption NASA originale:"Boulders are one of the possible keys to determining which processes have eroded, transported and deposited material on Mars (i.e.: Landslides, Mudflows, Flood Debris etc.).
During the first year in orbit, MGS-MOC obtained pictures with resolutions between 2 and 30 mt per pixel. It was found that Boulders are difficult to identify on Mars in images with resolutions worse than about 2-3 meters per pixel. Some rather larger Boulders (larger than about 10 mt in size) have already been seen on Mars by the orbiting camera.
This is a feat similar to that which can be obtained by "spy" satellites on Earth. The MOC image 53104 subframe shown here features a low, rounded Hill in South/Eastern Utopia Planitia. Each of the small, lumpy features on the top of this Hill is a Boulder.
In this picture, Boulders are not seen on the surrounding Plain. These Boulders are interpreted to be the remants of a layer of harder rock that once covered the top of the Hill, but was subsequently eroded and broken up by weathering and wind processes".MareKromium
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Craters-Becquerel_Crater-Layers-02.jpgBeautiful Layers inside Becquerel Crater: Camera Vision (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)153 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 MareKromium
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Deuteronilus_Mensae-PCF-LXTT-04.jpgFeatures of Deuteronilus Mensae (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 152 visiteCaption NASA:"Subtle and not-so-subtle color variations seen in this composite of MOC images M23-01279 and M23-01280 (acquired on January 19, 2001) trace both the movement of Dark Sand of possible Volcanic origin and fresh, Dark Outcrops of unweathered Bedrock".MareKromium
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Channels-Inverted_Channels_in_Arabia_Terra-PIA03643-01.jpgInverted channels of Arabia Terra (1 - Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)151 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 WinterMareKromium
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Martian_Mountains-MGS-02.jpgCharitum Montes (Natural Colors; credits: NASA/MGS/MSSS)150 visitenessun commento
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Channels-Inverted_Channels_in_Arabia_Terra-PIA03643-04.jpgInverted channels of Arabia Terra (2 - Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)150 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 WinterMareKromium
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Craters-Becquerel_Crater-Layers-01.jpgBeautiful Layers inside Becquerel Crater: Human Vision (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)150 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 MareKromium
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North_Polar_Features-The_Erg-PIA07375.jpgDark Dunes and Frost in the North Polar Erg (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)149 visiteCaption NASA originale:"This MGS-MOC image shows sand dunes in the North Polar Region of Mars, as they appeared during Northern Summer in December 2004".
Location near: 78.1° North Lat. and 227,2° West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: upper left
Season: Northern Summer
MareKromium
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Controversial_Features-The_D_M_Pyramid-02.jpgThe D&M Pyramid (Original NASA/MGS/MSSS b/w Frame)147 visiteCaption NASA originale:"The mosaics shows a Cydonia landform popularly known as the "D&M Pyramid." It is located near 40.7°N, 9.6°W. Although it is not really shaped like a pyramid, the Cydonia landform is 1 of thousands of massifs, buttes, mesas, knobs and blocks that mark the transition from the far northwestern Arabia Terra cratered highlands down to the northeastern Acidalia Planitia lowlands. Each block, whether shaped like a face, a pyramid, or simply a mesa, massif or knob, is a remnant of the bedrock of northeastern Arabia that was left behind as erosion slowly degraded the terrain along this zone between the highlands and the lowlands. A few outcroppings of layers in this ancient bedrock can be seen in the mosaic of the pyramid-like landform shown here; much of the landform is covered with eroded mantling material that was deposited long after this highlands remnant became an isolated feature in Cydonia".
Lunar Explorer, questa volta, concorda pienamente con quanto riportato nella caption NASA.
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