| Risultati della ricerca nelle immagini - "Cones" |
0301-Cones.jpgCones, from above (High-Def-3D; credits: Dr M. Faccin & Lunar Explorer Italia)86 visitenessun commentoMareKromium
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ESP_011403_1905_RED_abrowse.jpgCone at the Source of Athabasca Valles (Natural - but strongly enhanced - Colors; credits: Lunar Explorer Italia)55 visiteMars Local Time: 15:50 (middle afternoon)
Coord. (centered): 10,2° North Lat. and 157,4° East Long.
Spacecraft altitude: 278,4 Km (such as about 174,0 miles)
Original image scale range: 27,8 cm/pixel (with 1 x 1 binning) so objects ~ 84 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 7,7°
Phase Angle: 50,7°
Solar Incidence Angle: 58° (meaning that the Sun is about 32° above the Local Horizon)
Solar Longitude: 183,6° (Northern Autumn)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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PSP_006667_2150_RED_abrowse-00-PCF-LXTT.jpgSmall "Cones", North of Olympus Mons (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit) 80 visiteOlympus Mons is the largest Volcano in the Solar System and is thought to have been active in the relatively recent past (which on Mars means many millions of years ago). While this towering giant gets a lot of the attention, it is surrounded by a vast field of other Volcanic Features. This HiRISE image takes a close look at one set of intriguing landforms: small Cones.
Cones similar to these are found atop the freshest Lava Flows on Mars in Athabasca Valles. In that location, HiRISE found proof that they formed by steam exploding through the Lava Flow. The steam was produced by boiling water (or ice) in the ground underneath the Lava Flow. Could the same thing have happened here?
Unfortunately, HiRISE finds that this area north of Olympus Mons is covered in a thick layer of Dust. While the wonderful resolution of HiRISE reveals details of the Ripples in the Dust, it cannot show us what is underneath the Dust. Therefore we cannot prove that these Cones formed the same was as the Athabasca Valles ones.
They could be small Volcanic Vents, but it is unlikely that so many small eruptions would have taken place so close together.
However, since we cannot show that the ground under the Dust is actually Lava, we cannot rule out non-volcanic processes. Still, the similarity in the shapes and sizes of these Cones to the ones in Athabasca Valles leaves open the possibility that Water and Lava interacted explosively here.MareKromium
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PSP_009177_1985_RED.jpgCratered Cones in Isidis Planitia (natural colors; credits: Lunexit)53 visiteThis image shows part of a broad field of cratered cones in the Isidis Planitia region of Mars. The cones occur over a wide area and are commonly aligned in chains, like those here.
The cratered-cone morphology suggests formation by eruption of some material. The cones resemble small volcanoes on Earth called cinder cones, and are approximately the same size. Another possibility is that these are mud volcanoes, formed by eruption of wet, pressurized mud. This has been suggested as an important process in some parts of Mars. The aligned chains probably indicate sites of weakness, perhaps faults, where lava or mud could preferentially rise.
The scene is relatively bland in color, but this could be due to a thin coating of dust veiling color differences. The cones are clearly not very young or pristine; they have a battered, pitted appearance. However, they have not been heavily eroded, as features like the cone rims are still sharp in most cases. This state is typical of the cones in Isidis region.
MareKromium
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Psp_009478_1770_red.jpgCratered Cones in Zephyria Planum (False Colors; credits: Lunar Explorer Italia)53 visiteMars Local Time: 15:21 (early afternoon)
Coord. (centered): 3,1° South Lat. and 152,3° East Long.
Spacecraft altitude: 286,5 Km (such as about 179,0 miles)
Original image scale range: 28,7 cm/pixel (with 1 x 1 binning) so objects ~86 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 20,4°
Phase Angle: 72,7°
Solar Incidence Angle: 56° (meaning that the Sun is about 34° above the Local Horizon)
Solar Longitude: 107,8° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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Psp_009544_2160_red.jpgCratered Cones in Galaxias Colles (Saturated Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunar Explorer Italia)53 visiteMars Local Time: 15:20 (early afternoon)
Coord. (centered): 35,7° North Lat. and 147,0° East Long.
Spacecraft altitude: 295,9 Km (such as about 185,0 miles)
Original image scale range: 29,6 cm/pixel (with 1 x 1 binning) so objects ~89 cm across are resolved
Map projected scale: 25 cm/pixel
Map projection: EQUIRECTANGULAR
Emission Angle: 0,8°
Phase Angle: 44,1°
Solar Incidence Angle: 45° (meaning that the Sun is about 45° above the Local Horizon)
Solar Longitude: 110,1° (Northern Summer)
Credits: NASA/JPL/University of Arizona
Additional process. and coloring: Lunar Explorer ItaliaMareKromium
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