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Titan-Crescent-EB-LXTT.jpgCrescent Titan (Natural Colors; Special Processing by Elisabetta Bonora - Lunexit Team)55 visitenessun commentoMareKromium
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Titan-Crescent-EB-N00154034.jpgRising from the Rings... (Natural Colors; credits for the additional process. and color.: Elisabetta Bonora - Lunexit Team)101 visitenessun commentoMareKromium
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Titan-Cryovolcanism-00.jpgCryovolcanism on Titan? (1)54 visiteDa "NASA - Picture of the Day" del 10 Giugno 2005:" Investigators suspect the newly discovered domed feature detailed in the next frame is an ice volcano, or cryovolcano, seen in infrared light (...). Since Titan's surface temperature is around -180° C, 'lava' welling up to form the volcanic mound would be icy indeed - possibly a slurry of methane, ammonia and water ice combined with other ices and hydrocarbons. The circular feature is roughly 30 Km in diameter. If its volcanic nature is confirmed, the discovery of cryovolcanism on Titan could explain the origin of methane in Titan's atmosphere".
A nostro parere quest'idea del fenomeno crio-vulcanico (e della 'lava di ghiaccio') su Titano è solo un'altra - orrenda - 'boutade' NASA la quale, pur di riuscire a NON staccare nemmeno un mattoncino dalla Cattedrale della Scienza Consolidata, si aggrappa - tentando di spiegare in maniera rassicurante le nuove ed incredibili fenomenologie che lo Spazio ci offre quasi ogni giorno - alle ipotesi più fantasiose.
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Titan-Cryovolcanism-01.jpgCryovolcanism on Titan? (2)53 visiteNoi non pretendiamo di avere le conoscenze ed i mezzi di cui dispone la NASA, e non pensiamo di poter entrare in competizione con i loro Scienziati, però non siamo neppure così sprovveduti ed ignoranti dal 'bere acriticamente' tutte le spiegazioni che ci vengono offerte da questi Signori per 'salvare' il cosiddetto 'Sapere Comune'.
Conoscete il 'Rasoio di Occam'? Secondo Voi, è più probabile che:
1) il vulcano di Titano è un vulcano nel senso terrestre del termine e la temperatura superficiale di questo Pianeta, assieme a tantissimi altri dati e fenomeni (incluso il 'Red Hot Spot') attinenti la sua composizione e la sua struttura, sia superficiale, sia interna, non sono stati interpretati correttamente, oppure
2) le valutazioni NASA ed ESA sono tutte corrette ed il grande vulcano di Titano erutta ghiaccio d'acqua, fanghi a base di ammoniaca ed idrocarburi vari mentre tutto il resto del Pianeta è esattamente così come viene prefigurato dai Sacerdoti della Scienza Convenzionale?
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Titan-Cryovolcanism-02.jpgCryovolcanism on Titan? (3)55 visiteInsomma: è più "credibile" che la nostra Scienza sia ancora fortemente limitata ed il nostro Sapere ancora - purtroppo - molto lontano dal potersi definire capace di interpretare con assoluta accuratezza una buona parte dei fenomeni che accadono nel nostro (piccolo) Sistema Solare e quindi nell'Universo oppure dobbiamo arrenderci all'idea che ormai 'abbiamo capito tutto' (o 'quasi tutto'...) e che ogni fenomeno è spiegabile facendo ricorso ad una macchina fotografica, ad uno spettrometro ad infrarossi ed a qualche altro aggeggio elettronico dalla sigla impossibile a pronunciarsi?
Scienza non è solo calcolo ma è anche (e forse soprattutto...) riflessione, umiltà, senso comune, capacità di meravigliarsi, capacità di dire - talvolta - "non sappiamo, non abbiamo idea di che cosa stiamo guardando".
Pensateci sopra...
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Titan-Cryovolcanism_Map-PIA11701.jpgIR Map of Titan's Active (Cryovolcanic) Regions54 visiteThis infrared projection map of Titan was composed from images taken by NASA's Cassini Spacecraft, Visual and Infrared Mapping Spectrometer. The location of two regions that changed in brightness are labeled. These regions are hypothesized by some to be areas of cryovolcanic activity on Titan.
Rather than erupting molten rock, it is theorized that the cryovolcanoes of Titan would erupt volatiles such as Water, Ammonia and Methane. Scientists have suspected cryovolcanoes might be on Titan, and the Cassini mission has collected data on several previous passes of the moon that suggest their existence. Imagery of the moon has included a suspect haze hovering over flow-like surface formations, which are plausibly the result of icy volcanism.
Some Cassini scientists indicate that such volcanism could release Methane from the interior, which explains Titan's seemingly continuous supply of fresh Methane. Without replenishment, scientists say, Titan's original Atmospheric Methane should have been exhausted long ago.
This image is an overlay of all the high-resolution images from the first 45 flybys, up through last February 2007. The map was created using what 2,1 micron wavelength. Image scale is about 25 Km (approx. 16 miles) per pixel or 1,8 pixels per degree".MareKromium
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Titan-Cryovolcanism_Map-PIA11702.jpgActive Cryovolcanism on Titan?54 visiteCaption NASA:"The Cassini Radar Mapper imaged Titan on Feb. 22, 2008 (as shown on the left) and April 30, 2006 (as shown on the right).
These radar images show the outlines of Regions "1" and "2" identified by Cassini's VIMS (such as the Visual and Infrared Mapping Spectrometer) and inferred to be variable (see VIMS flat map, PIA11701), and which have been hypothesized to be due to cryovolcanic activity. The lobate, flow-like features in Region 1 are consistent with this interpretation.
Region 1 is just north of the feature named Hotei Arcus and is centered on 28° South Lat. by 78° West Long.
The Region is about 400 Km (approx. 249 miles) across. Region 2 is on the western part of Xanadu and is centered on 7° South Lat. by 135° West Long. This region is about 900 Km (approx. 560 miles) across. In both cases, North is up, and features as small as 300-500 meters can be resolved".MareKromium
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Titan-Dunes-IMG002116-br500.jpgThe Dunes of Titan and the Namibian Dunes54 visiteCassini radar sees sand dunes on Saturn's giant moon Titan (upper photo) that are sculpted like Namibian sand dunes on Earth (lower photo). The bright features in the upper radar photo are not clouds but topographic features among the dunes.
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Titan-Dunes-PIA03567.jpgTitanian Dunes54 visiteOriginal caption:"Large areas of this Cassini synthetic aperture radar image of Titan are covered by long, dark ridges. They resemble the "cat scratches" seen in other places on Titan, but here they are longer and straighter. Spaced about 1 to 2 Km apart, they curve slightly around teardrop-shaped bright terrain, giving the impression of a Japanese garden of sand raked around boulders. The bright material appears to be high-standing rough material that the ridges bend around. This suggests that the ridges are dunes that winds have blown across the surface of Titan from left to right (roughly West to East).
This image was taken during the ninth Titan flyby on Oct. 28, 2005, (the fourth flyby for Cassini's synthetic aperture radar), at a distance of about 1300 Km (about 800 miles).
The image covers an area roughly 140 by 200 Km. It is located 13° South Lat. and 300° West Long.".
Nota: il vero mistero è 'dove' e 'come' la NASA abbia visto ed interpretato i rilievi in questione come possibili dune...
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Titan-Dunes-PIA03568.jpgThe "Cat Scratches"54 visiteOriginal caption:"The geologic diversity of Titan's surface is well illustrated by this synthetic aperture radar image, obtained on Oct. 28, 2005, during the Cassini spacecraft's 9th Titan fly-by and 4th radar pass.
The bottom left and top right parts of the image show a series of parallel features resembling those discovered during the second radar pass. Called "cat scratches", these features may be dunes of water ice or hydrocarbon particles. The brighter area on the bottom right is thought to be rougher and possibly higher in elevation than the darker areas. Above the center of the image are dark, narrow winding channels carved by, and possibly still containing, liquids.
This image is about 300 by 250 Km and it is located 10° South Lat. and 292° West Long.".
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Titan-Dunes-PIA08738.jpgLongitudinal Dunes?54 visiteCaption NASA originale:"This image from Cassini's radar instrument was acquired by the Cassini radar instrument in synthetic aperture mode during a Sept. 7, 2006, flyby of Titan. The image shows long, dark ridges similar to those seen in previous flybys. These are interpreted to be "Longitudinal Dunes". Dunes are mostly an equatorial phenomenon on Titan and the material forming them may be solid organic particles or ice coated with organic material. Spaced up to 3 Km(about 2 miles) apart, these dunes curve around bright features that may be high-standing topographic obstacles, in conformity with the wind patterns.
The interaction between the 2 types of features is complex and not well understood, but clearly the topography and the dunes have influenced each other in other ways as well.
This image is centered at 44° West Long., 8° North Lat. and covers approx. 160 by 325 Km (such as about 99 by 202 miles) on Titan's surface. The smallest details in this image are about 500 mt (approx. 550 yards) across".
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Titan-Dunes-PIA09111.jpgTitanian Dunes54 visiteCaption NASA:"This pair of images, taken by the Cassini spacecraft radar mapper on two different Titan passes on Dec. 11, 2006 (T21 left) and Oct. 29, 2005 (T8 right), represent two different views of a field of dunes located near 9,4° South Latitude by 290° West Longitude.
The images were taken in synthetic aperture mode and have a resolution of approximately 500 mt(1.640 feet). North is toward the top of both images and each image is approx. 400 Km (250 miles) long by 275 Km (about 170 miles) wide.
The images are different only because the radar instrument illuminated the dunes from different directions. Acting somewhat like a flash camera, the radar sends out microwave pulses and makes an image from the pulses after they are reflected back. Imagine that both the camera and the flash come from the left in the left image and from the top in the right image.
Most obvious differences are seen in the large bright feature at the center of both images. At left, its left edge is brighter, emphasizing the more steep slopes there. Farther left, the dunes are more clearly defined in the right image as their faces are caught by the illumination. However, since the dunes are visible in both images, it is likely that the materials making up the dark and light stripes are also somehow different. More detailed studies of how materials on Titan reflect and scatter at different angles are giving us clues about what different materials might be present in this cold and distant world".
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