| Piú votate - Titan: The "Foggy" Moon |
Titan-W00013654.jpgA "bright light" in the clouds?57 visiteCerchiatura Bianca: la macchia bianca che vediamo fra le nuvole di Titano è un gruppo di 8 "dead-pixels" circondato da un grappolo di almeno una ventina di "bad-pixels" (e dunque uno dei soliti photoartifact), oppure si tratta di un oggetto luminosissimo il quale ha provocato la evidentissima sovraesposizione della zona in cui si trovava al tempo dello scatto?
Caption originale:"W00013654.jpg was taken on February 27, 2006 and received on Earth February 27, 2006. The camera was pointing toward TITAN at approximately 34.753 Km, and the image was taken using the CB3 and CL2 filters. This image has not been validated or calibrated".
(4 voti)
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Titan-IMG001935-br500.jpgTitan during Fly-By n. 9 (Original NASA/JPL/SSI RAW b/w Frame)62 visiteOriginal caption:"This image was taken on December 26, 2005 and received on Earth December 27, 2005. The camera was pointing toward TITAN that, at the time, was approximately 57.509 Km (about 35.734 miles) away.
This image was taken using the CB3 and CL2 filters and has not been validated or calibrated".
(4 voti)
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Titan-Channels-Unnamed_Channels-PIA03565.jpgTitan's rainfall?!?57 visiteIn contrast to the image "Canyonlands on Titan", this bright terrain is cut by channels that are variable in width; they form both radial and branching networks and such patterns are reminiscent of networks formed by rainfall on Earth.
At the bottom of the frame, the channels radiate from a possible source into a dark, smooth region that seems flatter and more plains-like. One interpretation is that the higher, rougher terrain has been cleansed of organic debris and eroded by methane rainfall. The removed material has then been deposited into the lower plains.
This Cassini SAR image of Titan was taken on Sept. 7, 2005, at a distance of 2000 Km from Titan. It is located near 48° South Latitude, 14° West Longitude and extends about 240 Km right to left.
(4 voti)
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Titan-Lakes-South_Polar_Lake-01-PIA06241-PCF-LXTT-IPF-000.jpgOntario Lacus and the South Polar Regions of Titan59 visiteCaption NASA originale:"Although it is far too cold for blossoming flowers, summer does bring storm clouds and presumably rain to Titan's south polar region.
The observed persistence of convective storm activity in the region during the Southern Titan Summer has led scientists to speculate that the dark, footprint-shaped feature near the upper left could be a past or present reservoir for Titan's methane rains".
(4 voti)
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Titan-Cryovolcanism-01.jpgCryovolcanism on Titan? (2)58 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?
(4 voti)
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Titan-Volcano-01-PIA07961.jpgThe Titanian Volcano (2)59 visiteCaption NASA originale:"Details of the circular feature, that scientists think is an ice volcano, which could be a source of methane in Titan's atmosphere, show up at wvlgts larger than 1,3 microns (1 micron is one-millionth of a meter; 1 meter is 39"). The first 6 panels are images of the feature taken in 6 infrared windows. Images made up of two colors (ratio images) are represented in order to visualize compositional variations, which appear to be slight. The last panel is a color composite image (red, 2,75 micron; green, 2 micron; blue, 1,6 micron). These images were acquired with Cassini's VIMS. Titan, Saturn's largest moon, is the only known moon to have a significant atmosphere, composed primarily of Nitrogen, with CH4 (about 2/3%) as the largest remaining component. One goal of the Cassini mission is to find an explanation for what is replenishing and maintaining this atmosphere".
(4 voti)
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Titan-Volcano-00-PIA07961.jpgThe Titanian Volcano (1)78 visiteCaption NASA originale:"On Oct. 26, 2004, the Cassini spacecraft flew over Titan at less than 1.200 Km at closest approach. Cassini acquired several infrared images with spatial resolution ranging from a few tens of Km to 2 Km per pixel. The Visual and Infrared Mapping Spectrometer took images from visible wavelengths to the 5,1 micron wvlgts. This figure shows the mosaic obtained at the 2,03 micron wvlgt - observations are centered on the hemisphere of Titan that points away from Saturn. The left (inset) HR image is 30 Km per pixel. It shows the site where the ESA's Huygens probe successfully landed on Jan. 14, 2005. The right inset shows a circular feature that scientists think is a volcano, which may be responsible for replenishing Titan's methane atmosphere".
Nota: la notizia viene inserita nel corpo del testo, silenziosamente, come se si trattasse di un fatto marginale nel quadro di una notizia irrilevante. Ma guardate e leggete i frames successivi...
(4 voti)
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Titan-Huygens_Landing_Site-13-PIA07871.jpgHuygens Landing Site56 visiteCaption NASA originale:"This mosaic from the Descent Imager/Spectral Radiometer camera on the European Space Agency's Huygens probe combines 17 image triplets, projected from an altitude of 800 mt (approx. 2.625 feet).
The area covered is approximately 1,3 Km across (North at the top of the image). The smallest visible objects visible are less than 5 mt across and the dark channels are 30 to 40 meters (approx. 98 to 131 feet) wide.
The images were then stitched together using one of several projection algorithms (in this case 'gnomonic') to produce a full mosaic. The images used to construct this mosaic were taken on Jan. 14, 2005".
Commento: a nostro parere si tratta di immagini complesse (e piuttosto confuse), estremamente difficili da interpretare in maniera convincente (almeno sulla base di ricostruzioni come queste due che Vi abbiamo proposto).
(4 voti)
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Titan-4-PIA06227.jpgTitan in three different wavelenghts: is it always Titan?58 visiteCaption NASA originale:"All of these images were taken with the Cassini spacecraft wide angle camera on April 16, 2005, at distances ranging from approximately 173.000 to 168.200 Km (such as approx. 107.500 to 104.500 miles) from Titan and from a Sun-Titan-spacecraft angle of 56°.
Resolution in the images approximately 10 Km per pixel".
(4 voti)
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Titan-Atmosphere-N00031071.jpgThe "Foggy" Limb of Titan58 visiteIl 4° fly-by di Titano si è compiuto e dalla Sonda Cassini, come al solito, ci arrivano una marea di frames completamente (o quasi) inesplicabili. Gli artifacts fotografici, come vedete in questo frame che abbiamo scelto fra tantissimi uguali, sono tanti (e la pulitura elettronica delle immagini avverrà solo in un futuro imprecisato); i rilievi della superficie di Titano - come ovvio - sono assolutamente impossibili da cogliere senza l'ausilio di attrezzature e tecniche all'avanguardia. Il risultato, purtroppo, è che noi non siamo in grado di dirVi nulla di "nuovo" su questa comunque affascinante Luna "Nebbiosa". La NASA, come sapete, esprime - di tanto in tanto - qualche commento a riguardo, ma il tutto si esaurisce (come per Marte) in grandi bolle di sapone: pillole di Scienza "usa & getta" che possono essere utili a dei Divulgatori (come noi, per esempio), ma che non servono quasi a nulla nel momento in cui si intendessero fare degli studi e delle ricerche un pò più profondi/e e dettagliati/e.
Peccato...
(4 voti)
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Titan_and_Epimetheus-N00028722.jpgTitan and Epimetheus63 visitenessun commento
(4 voti)
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Titan-Channels-Unnamed_Channels-Radar_Mapping-PIA07009.jpgChannels on Titan or just Windstreaks?60 visiteCaption NASA originale:"Running across the image (about 300 Km across) are a series of roughly parallel, mostly east-west dark linear features that join and separate, which are not seen in the previous radar images. They may be formed by the action of eastward-flowing winds, or geologic processes acting on the crust itself. In places they cut through adjacent terrain, while elsewhere the lineaments seem to be interrupted by brighter material, appearing again on the other side. Seams between radar segments are visible as horizontal, sawtooth-shaped lines. Bright material in radar images may be rough or sloped toward the radar (which is observing from the top in this frame). Also, some of what is seen may in fact be below the surface, revealed as the radio waves penetrate overlying, radar-transparent material".
(4 voti)
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