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T-TRA_000853_1900_RED_MarteValles_01.jpgSeepage in Marte Vallis (Natural Colors; credits: Lunar Explorer Italia)58 visitenessun commentoMareKromium
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ESP_012873_1075_RED_abrowse.jpgPolar Pit (Natural Colors; credits: Lunar Explorer Italia)58 visiteThis image features the North Wall and Floor of a Polar Pit in the Southern Hemisphere. The Pit Wall is sculpted into a row of gullies. Gullies typically have a triangular start upslope, followed by a channel that transported material, and a triangular debris fan downslope.
Polar Pit Gullies might be related to seasonal changes in frost coverage, but their exact origin is currently unknown. The Gullies appear bright because they probably have seasonal frost on them. The Pit Floor contains a field of dark Sand Dunes.
Wind has transported sand across the Martian Surface, and it was deposited in this Pit and formed dunes.
Some of the sand in the Dunes might have come from the gully debris fans or other erosion of the Pit wall. The bright material within the dunes and along the floor is seasonal frost that is probably composed of CO2 and water ice.MareKromium
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ESP_011903_1465_RED_abrowse.jpgOld Features (Natural Colors; credits: Lunar Explorer Italia)58 visitenessun commentoMareKromium
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ESP_011910_1825_RED_abrowse.jpgUnnamed Crater with Layering in Meridiani Planum (Natural Colors; credits: Lunar Explorer Italia)58 visitenessun commentoMareKromium
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ESP_012075_1015_RED_abrowse.jpgPossible Hydration in High Southern Latitudes' Region (Natural Colors; credits: Lunar Explorer Italia)59 visitenessun commentoMareKromium
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ESP_011898_1535_RED_abrowse.jpgPossible MSL Landing Site in Holden Crater (Natural Colors; credits: Lunar Explorer Italia)57 visitenessun commentoMareKromium
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ESP_012271_0940_RED_abrowse.jpgSouth Polar "Swiss-Cheese Surface Features" (Natural Colors; credits: Lunar Explorer Italia)61 visiteThis image represents a Martian Terrain containing "Swiss Cheese" features. This Terrain is found only within the residue of the Southern Polar Cap, which comprises of mostly frozen CO2 and H2O.
These particular features are flat-floored, circular depressions that are believed to form from different rates in the seasonal changes of the CO2 and H2O ices. Varying rates in sublimation (when these ices change directly to vapors upon heat and back to deposited solids upon cooling) produces these rimmed depressions from the flat polar ice plane. It is hypothesized that the depression areas are made up of dry ice - such as Carbon Dioxide - and the material below consists of the water ice.
This Carbon Dioxide solid rises and slightly evaporates into the thin Atmosphere in the Summer while the water layer remains in place. As the South Pole cools with seasonal change, the "Swiss Cheese" formation is obtained with risen CO2 rimmed depressions and flat water mesas.
The Martian North Pole will evaporate all of its CO2 in the Summer; however the South Pole is colder and this may explain why this Terrain is only found in this area.
Some of the circular features in the full image show distinct cusps that point in the direction of the Pole. These cusps suggest insolation, a measure of solar radiation that is pushing the movement/formation of these depressions away from the Pole. There is also an observed lateral outward growth of the features at the rate of about 1-to-3 meters a year, indicating to scientists that the depressions must form in a CO2 medium.MareKromium
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ESP_011896_1570_RED_abrowse.jpgSouthern Crater Field (Natural Colors; credits: Lunar Explorer Italia)58 visitenessun commentoMareKromium
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ESP_011894_1455_RED_abrowse.jpgAlluvial Features in Hellas Planitia (Natural Colors; credits: Lunar Explorer Italia)58 visitenessun commentoMareKromium
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ESP_011917_1790_RED_abrowse.jpgEmbayed Crater in Elysium Planitia (Natural Colors; credits: Lunar Explorer Italia)59 visitenessun commentoMareKromium
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ESP_011610_0935_RED_abrowse.jpgSawtooth Pattern in Carbon Dioxide Ice (Natural Colors; credits: Lunar Explorer Italia)60 visitenessun commentoMareKromium
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ESP_012941_0930_RED_abrowse.jpgLandforms on the South Polar Residual Cap (Natural Colors; credits: Lunar Explerer Italia)57 visiteThis HiRISE image is located on the Carbon-Dioxide (CO2) rich Residual South Polar Ice Cap near 86° South Lat. and 353° East Long.
These rounded landforms evolve relatively quickly and erode into the surface of the Ice Cap (approximately 4-5 meters or 15 feet per year).
Their interesting shapes make for a striking appearance on the Surface.MareKromium
(4 voti)
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