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Landslides-Tithonium_Chasma-MGS-02.jpgHuge Landslide near Tithonium Chasma (Original NASA/MGS/MSSS b/w Frame)59 visiteCaption originale:"This MGS-MOC image shows a small portion of a large landslide deposit located on the floor of western Tithonium Chasma".
Location near: 4,3° South Lat. and 87,9° West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Southern Summer
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Telesto-PIA07702.jpgTelesto59 visiteThe Cassini spacecraft passed within a cosmic stone's throw of Telesto in October, 2005 capturing this shot of the tiny Trojan moon. Telesto (24 Km, or 15 miles across) appears to be mantled in fine, icy material, although a few craters and some outcrops and/or large boulders are visible. Its smooth surface does not appear to retain the record of intense cratering that most of Saturn's other moons possess.
The image was taken in polarized green light with the Cassini spacecraft narrow-angle camera on Oct. 11, 2005, at a distance of approx. 14.500 Km (9.000 miles) from Telesto. The image scale is 86 mt (about 283 feet) per pixel.
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OPP-SOL732-1M193175800EFF64NTP2906M2M1.jpgRazorblades: detail mgnf (3) - Sol 73259 visiteCaption originale:"Microscopic Imager Non-linearized Full frame EDR acquired on Sol 732 of Opportunity's mission to Meridiani Planum at approximately 14:07:48 MLT.
Microscopic Imager dust cover commanded to be OPEN".
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Clouds-South_Polar_Regions-PIA02182-1.jpgThick Clouds over the South Pole (Original NASA/MGS/MSSS b/w Frame)59 visiteCaption originale:"In this image the Martian Surface is completely hidden from view by thick clouds. The thickness of the clouds indicates the dust is a major component of the clouds. Images like this one can provide vital information about the atmosphere and climate of Mars today. This image was collected during late Summer near the South Pole".
Image information: VIS instrument;
Latitude: - 69,9° N;
Longitude: 235,3° E;
Resolution: 17 meter/pixel.
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Rhea-PIA08120.jpgRhea, from 245.000 Km and in "extreme" false colors...59 visiteBright, wispy markings stretch across a region of darker terrain on Rhea. In this extreme false-color view, the roughly North-South fractures occur within strips of material (which appear greenish here) that are a different color from the surrounding cratered landscape. To create the false-color view, ultraviolet, green and infrared images were combined into a single black and white picture that isolates and maps regional color differences. Most of the large-scale variations in brightness across the surface are removed by this process. This color map was then superimposed over a clear-filter image. The origin of the color differences is not yet understood, but it may be caused by subtle differences in the surface composition or grain sizes making up the icy soil. Wispy markings were seen on the trailing Hemispheres of both Rhea and Dione, in images taken by Voyager spacecrafts, and were hypothesized by some researchers to be the result of material extruded onto the surface by ice volcanism.
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Chaotic_Terrain-Aram_Chaos-R2200155-02.jpgThe "Many Faces" of Aram Chaos (3 - EDM n. 2 - Original NASA/MGS/MSSS b/w Frame)59 visiteUna speculazione ulteriore del Dr Skipper è che una possibile forma di Civiltà Indigena Marziana stia cercando di "salvare il salvabile", ossìa - impiegando sistemi e tecnologie che non riusciamo a comprendere (nè a vedere) - stia tentando in tutti i modi di mantenere almeno un minimo di acque correnti sulla superficie di Marte.
"If so and there are actually extensive civilization populations on Mars, it may seem strange at first blush that so many of them appear to be so focused on water on such a generally arid planet to the point of even getting in the water that is left with their developments. On the other hand, if these populations have historically been part of this drying planetary reality for a very long time and have a historical memory base of more water plentiful times, it may be understandable that they may a bit compulsively try to preserve as much as possible a current semblance of the older loved conditions. Of course there may be other reasons as well"
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Chaotic_Terrain-Aram_Chaos-R2200155-09.jpgThe "Many Faces" of Aram Chaos (10 - EDM n. 9 - Original NASA/MGS/MSSS b/w Frame)59 visiteE dunque, alla fine, qual'è il "vero volto" di Aram Chaos, come del resto di Marte? Noi non lo sappiamo, ovviamente, però, come fa il Dr Skipper (che comunque stimiamo) e tanti altri Ricercatori, noi continuiamo a cercarlo...
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Titan-W00013654.jpgA "bright light" in the clouds?59 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".
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Titan-W00013655.jpgThe "bright light" is gone59 visiteFrame immediatamente successivo a quello che evidenziava un luce bianca e brillante (8 pixels) negli strati superiori dell'atmosfera di Titano: ora tutto appare "normale". Si trattava dunque di un photoartifact o di un oggetto reale?
Caption originale:"W00013655.jpg was taken on February 27, 2006 and received on Earth February 27, 2006. The camera was pointing toward TITAN at approximately 32.110 Km away, and the image was taken using the CB3 and CL2 filters. This image has not been validated or calibrated".
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Comets-Comet_Pojmanski-2.jpgThe "Pojmanski" Comet59 visiteE' passata inosservata, lontana dalla nostra Terra, ed è stata ben lungi dall'essere spettacolare come lo fu, qualche anno fa, la meravigliosa Hale-Bopp.
Certo, la cometina Pojmanski non aveva - forse - i numeri giusti per entrare nell'Albo delle (cosiddette) Grandi Comete, ma certo è che i media (TUTTI!) se ne sono guardati bene dal pubblicizzarla. E la NASA? Leggerete Voi stessi le scarne note prodotte al riguardo nel "NASA - Picture of the Day" del giorno 6 Marzo 2006. Noi, nel nostro piccolo, dato che ci meravigliamo per niente, siamo andati in cerca di fotografie di questa cometa ed abbiamo "scoperto" una straordinaria somiglianza fra C/2006 A1 (la Pojmanski Comet appunto) e la C/2004 Q2 (meglio nota come Machholz Comet). Uguale tipologia - o classe visuale - di appartenenza (nucleo sferico e chioma filiforme) e, soprattutto, uguale colore (ergo uguale - o comunque molto simile - composizione chimica). Deduzione logica: si tratta di "Sister-Comets". Domanda: ci sono altre "sorelle" in arrivo?!?
Have you ever seen a comet? Comets bright enough to be visible to the unaided eye appear only every few years. Right now, however, a new comet has brightened unexpectedly and is visible as a faint streak to the unaided northern observer in the eastern morning sky just before sunrise. Binoculars may help. Comet Pojmanski, officially designated C/2006 A1 and discovered only in January, now sports a turquoise tail several times longer than the full moon. Comet Pojmanski's ion tail is due to gas particles expelled by the comet being pushed away from the Sun by the solar wind, the same wind that ionizes gas in the tail causing its blue tint. Pictured above as it appeared only last week, Comet Pojmanski has now begun to fade as its orbit around the Sun takes it further from the Earth.
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Enceladus-PIA07794.jpgEnceladus' surface temperatures (2)59 visiteEnhanced thermal emission is seen in the vicinity of the prominent "Tiger Stripe" fissures discovered by the imaging cameras.
In these images, the excess emission is most strongly seen in the left-most composite Infrared Spectrometer field of view, which includes a fissure near the end of one of the Tiger Stripes. The peak temperatures, 86 and 90 Kelvin (such as about -305 and -298 Fahrenheit) respectively, are averages over the Composite Infrared Spectrometer field of view, and other composite Infrared Spectrometer data suggest that much higher temperatures, up to at least 145 Kelvin (such as -199 Fahrenheit), occur in narrow zones a few hundred meters wide along the Tiger Stripe fissures.
The 1st image is centered near long. 135° W. and lat. 65° S. and each square from the composite infrared spectrometer field of view is about 17,5 Km (approx. 10,9 miles) across.
The 2nd image was taken nearly 3 times closer to Enceladus and is centered near long. 120° W, lat. 82° S.
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Enceladus-PIA07798.jpgEnceladus' active South Pole (1)59 visitePlumes of icy material extend above the Southern Polar Region of Enceladus, as imaged by the Cassini spacecraft in February 2005. The monochrome view is presented along with a color-coded version on the right. The latter reveals a fainter and much more extended plume component.
Images like these are being analyzed by scientists as they seek to explain the processes that could be producing such incredible features. As reported in the journal Science on March 10, 2006, imaging scientists believe that the plumes are geysers erupting from pressurized subsurface reservoirs of liquid water above 273 degrees Kelvin (0° C.).
Another plume view was taken 1 month earlier and looks broadside at the moon's prominent "Tiger Stripe" fractures. In the January view, the plume appears to have a single component. The February view looks along the Tiger Stripe fractures and reveals both a large and a small component to the plume; the smaller, fainter component is separated from the main plume by about 100 Km.
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