| Risultati della ricerca nelle immagini - "Gorgonum" |
Gorgonum_Chaos-PSP_010611_1425-MF-LXT.jpgCollapse Features in Gorgonum Chaos (by Dr M. Faccin)80 visite...Probabilmente troveremo questo frame, sezionato e scopiazzato da qualche altra parte del World Wide Web, senza la menzione del nostro eccezionale Marco Faccin e di Lunexit, ma in ogni caso una considerazione la si può fare: questa è Arte! E lo è perchè la Superficie di Marte che vedete in questi frames non è stata solo (addizionalmente) "processata".
Essa è stata assolutamente INTERPRETATA: in texture e colori. Ed un Lavoro simile - se non altro Pubblicamente - nemmeno la NASA lo fa.MareKromium
|
|
Gullies-_Gorgonum_Chaos-PIA13267.jpgGullies in Gorgonum Chaos (Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)55 visiteThis observation from NASA's Mars Reconnaissance Orbiter (MRO) shows part of Gorgonum Chaos, a large cluster of Chaotic Terrain found in the Southern Hemisphere.
Many Regions of Chaotic Terrain are found at the head of large Outflow Channels that were scoured by ancient floods. Gorgonum Chaos is one Region that is NOT associated with an Outflow Channel.
Chaotic Terrain can form when Subsurface Volatiles (such as water) are catastrophically released and the overlying surface collapses. It is not known whether isolated Chaotic Terrain -- such as that shown in this image -- formed in the same way that the ones near the Outflow Channels did. However, some wind-erosion activity might have played a role in their formation.
Gorgonum Chaos is an especially interesting area because Gullies thought to have been eroded by liquid water are located on its Mesas. The Gullies have a wide range of orientations and many appear to emanate from a distinct layer in the Mesas. It is not known why Gullies form on one slope rather than another, but the "Insolation" (sucgh as the amount of sunlight received), availability of water, and regional slope are possible contributing factors.MareKromium
|
|
PSP_001948_1425_red.jpgGorgonum Chaos (Original NASA/JPL/University of Arizona b/w Frame)53 visitePSP_001948_1425 shows part of Gorgonum Chaos, a large cluster of chaotic terrain found in the Southern Hemisphere.
Many regions of chaotic terrain are found at the head of large outflow channels that were scoured by ancient floods. Gorgonum Chaos is one region that is not associated with an outflow channel. Chaotic terrain can form when subsurface volatiles (such as water) are catastrophically released and the overlying surface collapses. It is not known whether isolated chaotic terrain — such as that shown in this image — formed in the same way that the chaotic terrain near the outflow channels did. Wind erosion might play a role in their formation.
Gorgonum Chaos is an especially interesting area because gullies thought to have been eroded by liquid water are located on its mesas. The gullies have a wide range of orientations and many appear to emanate from a distinct layer in the mesas.
It is not known why gullies form on one slope rather than another, but insolation (amount of sunlight received), availability of water, and regional slope are possible contributing factors.
|
|
PSP_002014_1415_RED_abrowse-00.jpgTrough in Gorgonum Fossae (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)79 visitePSP_002014_1415 shows Gullies in a Trough that is near Gorgonum Chaos, a Region filled with Gullies.
The Trough Gullies, like many of the Gullies on nearby Gorgonum Chaos' Mesas, appear to originate at a distinct Layer. There are Mounds within the Trough that have Layers exposed near their Peaks. The Layers in the Mound and on the Trough Walls are resistant, meaning they do not break up mostly into small particles that the wind can easily carry away.
Instead, they are breaking up into Boulders up to several meters wide that HiRISE can see (the fact that the Layers are eroding as boulders tells us that the material is not easily broken up into smaller and smaller pieces, so it is therefore termed "resistant to erosion").
However, it is not completely resistant to erosion as we can see by the Boulders rolling down the Slopes.
Gullies are thought by many to require liquid water to form and a major debate is whether this water comes from the surface (i.e., melting surface ice or melting snow) or the subsurface (i.e., from an aquifer).
Gullies are often found to originate at layers, like those seen here.
The subsurface water theory states that water travels under the surface to slope faces where it flows down the slope to form gullies. Visible layers are suggested to be impermeable, such that water cannot penetrate them, which is why the gullies originate from beneath the layers.
Often Gullies will originate between Layers, which suggests that there is a permeable Layer trapped between impermeable Layers.
It is also possible that the Layer preferentially traps ice or snow that may melt to form Gullies, thus providing a surface source of water to form the Gullies.
Please note that the stripe-like features on the lower side of the image are camera artifacts and not real features.MareKromium
|
|
PSP_004071_1425_RED_abrowse.jpgMesas in Gorgonum Chaos (CTX Frame - Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team) 87 visitePSP_004071_1425 shows Mesas that are part of Gorgonum Chaos, a Region of Chaotic Terrain, which is a jumble of Mounds and Mesas grouped together. Chaotic Terrain is most commonly found in Mars near the sources of the gigantic Outflow Channels. Gorgonum Chaos is one of the few exceptions.
Some of the Troughs between the Mesas appear to have V-shaped bottoms; there is no obvious flat floor in between. Others have Dunes running down their centers probably indicating flat floors.
It is possible that the Mesas were once connected and that something caused fractures in the original Mesa's Surface that were then preferentially eroded.MareKromium
|
|
PSP_004071_1425_RED_browse-01.jpgMesas in Gorgonum Chaos (edm - possible True Colors; credits: Lunar Explorer Italia)53 visitePSP_004071_1425 shows mesas that are part of Gorgonum Chaos, a region of chaotic terrain, which is a jumble of mounds and mesas grouped together.
Chaotic terrain is most commonly found in Mars near the sources of the gigantic outflow channels. Gorgonum Chaos is one of the few exceptions.
Some of the troughs between the mesas appear to have V-shaped bottoms; there is no obvious flat floor in between. Others have dunes running down their centers probably indicating flat floors. It is possible that the mesas were once connected and that something caused fractures in the original mesa's surface that were then preferentially eroded.MareKromium
|
|
T-TRA_000866_1420_RED.jpgGorgonum Chaos53 visiteThis HiRISE image shows cratered plains along the edge of a large fracture to the south of Gorgonum Chaos. The wall of the fracture is in shadow and, at first glance, appears to reveal little detail about the geologic setting. In reality, the high quality of the HiRISE image, as shown in the stretched sub-image [below], demonstrates that considerable detail along the wall of the fracture can be discerned. A relatively dark layer extends along the upper wall of the fracture and approximately separates the exposed wall above from talus below. Some well defined talus chutes are also visible and are formed by the down slope movement of debris shed from higher along the fracture wall. The wind blown drifts of fine grained sediment accumulated along the base of the talus slope are relatively free of obvious talus. Hence, the wind likely accounts for much of the most recent modification of the scene in the sub image.
|
|
T-TRA_000866_1420_RED.jpgGorgonum Chaos (Natural Colors; credits: Lunar Explorer Italia)54 visitenessun commentoMareKromium
|
|
| 8 immagini su 1 pagina(e) |
|
