| |
| Ultimi arrivi - Titan: The "Foggy" Moon |
Titan-N00124860.jpgTitan in possible True Colors (credits by Lunar Explorer Italia)57 visiteCaption NASA:"N00124860.jpg was taken on December 05, 2008 and received on Earth December 06, 2008. The camera was pointing toward TITAN that, at the time, was approximately 176.792 Km away.
The image was taken using the CL1 and CB3 filters". MareKromiumDic 08, 2008
|
|
Titan-N00124864.jpgTitan in possible True Colors (credits by Lunar Explorer Italia)58 visiteCaption NASA:"N00124864.jpg was taken on December 05, 2008 and received on Earth December 06, 2008. The camera was pointing toward TITAN that, at the time, was approximately 171.534 Km away.
The image was taken using the CL1 and CB3 filters".MareKromiumDic 08, 2008
|
|
Titan-PIA10514.jpgThe "Foggy" Moon (IR Light - possible True Colors; credits: Lunexit)81 visiteCaption NASA:"The Cassini Spacecraft looks through Titan's thick atmosphere to reveal bright and dark terrains on the Saturn-facing Side of the Planet's largest moon. North is up.
The image was taken with the Cassini Spacecraft narrow-angle camera on Oct. 11, 2008 using a spectral filter sensitive to wavelengths of IR Light centered at 938 nanometers. The view was obtained at a distance of approx. 2,2 MKM (about 1,3 MMs) from Titan and at a Sun-Titan-Spacecraft, or Phase, Angle of 10°.
Image scale is roughly 13 Km (about 8 miles) per pixel".MareKromiumNov 18, 2008
|
|
Titan-W00049900.jpgLost in the Space of Saturn... (natural colors; credits: Lunexit)59 visiteTitano: il disco, appena percettibile, splende di un leggero color giallo. Siamo a circa 1,8 MKM dalla "Luna Nebbiosa".MareKromiumNov 17, 2008
|
|
Titan-Clouds-North_Polar_Clouds-PIA10511.jpgBright Northern Clouds on Titan (natural colors; credits: Lunexit)102 visiteCaption NASA:"Bright clouds circumscribe Titan's North Polar Region: a frigid land of Methane Seas.
The clouds seen in this image and other recent Cassini Spacecraft views are at higher latitudes than similar streak-like clouds observed in the Southern Hemisphere (see PIA08966). Scientists are working to understand why such clouds appear preferentially at certain latitudes on Saturn's largest moon.
While the streaks that grace Titan's Southern Hemisphere are often seen at 40° South Latitude, similar to Wellington, New Zealand, the streaks in the Northern Hemisphere are farther from the Equator, near 56° North Latitude, which is similar to Glasgow, Scotland. North on Titan is up and rotated 16° to the right.
The image was taken with the Cassini spacecraft narrow-angle camera on Sept. 30, 2008 using a spectral filter sensitive to wavelengths of infrared light centered at 938 nanometers. The view was obtained at a distance of approx. 1,2 MKM (such as about (776.000 miles) from Titan and at a Sun-Titan-Spacecraft, or Phase, angle of 71°.
Image scale is 7 Km (about 4,5 miles) per pixel".MareKromiumNov 12, 2008
|
|
Titan-PIA10503.jpgLooking for Clouds... (IR - natural - but enhanced - colors; credits: Lunexit)94 visiteCaption NASA:"The Cassini Spacecraft peeks through the murk of Titan's thick atmosphere in a search for clouds. Although there are no obvious cloud features in this view, bright cloud streaks have occasionally been seen by Cassini and Earth-based telescopes in the region seen here toward the bottom of Titan's disk. Repeated monitoring observations like this one help scientists build an understanding of Titan's weather and the various climate processes operating on this frigid, but remarkably Earth-like moon.
This view looks toward the Saturn-facing Side of Titan (5150 kilometers, or 3200 miles across). North is up and rotated 35° to the left.
The image was taken with the Cassini Spacecraft narrow-angle camera on Sept. 25, 2008 using a spectral filter sensitive to wavelengths of Infrared Light centered at 938 nanometers. The view was acquired at a distance of approx. 1,7 MKM (such as about 1 MMs) from Titan.
Image scale is roughly 10 Km (approx. 6 miles) per pixel".MareKromiumNov 01, 2008
|
|
Titan-N00121492.jpgTitan (natural colors; credits: Lunexit)59 visitenessun commentoMareKromiumOtt 17, 2008
|
|
Titan-Channels-Unnamed_Channels-PIA10956.jpgXanadu's Channels (false colors; credits: Lunexit)57 visiteOn the final flyby of Cassini's original 4-year tour, its radar mapper captured these unusual channels on Titan at the edge of Xanadu, the widest seen in this area (For a radar image of Xanadu, see PIA08428). These might be active rivers carrying methane or debris, or they might be dry riverbeds similar to earthly "arroyos".
Past Cassini radar images have revealed different types of channels on Titan's surface (see PIA03565 and PIA07366). They vary from bright to dark in radar (rough to smooth), and from fan-shaped to braided to meandering.
Some, drain into lakes; others disappear. Some of these channels may be several hundred meters, or feet, deep.
This image, taken from the flyby on May 28, 2008, shows the border of Xanadu as the bright-dark boundary running from the upper left to lower right. Southward from that boundary is an unusual set of channels. While these are brighter (more roughly textured) than the surrounding terrain, some are only slightly brighter, and some are as wide as 5 Km (about 3 miles) — about the size of the River Thames at its mouth east of London.
They appear to flow out of the rough Region of Xanadu.
Careful inspection reveals smaller tributaries that wind through the brighter and apparently rougher terrain to the north. A close-up of one of the widest channels is shown at the lower left.
Scientists think that many of the channels on Titan are carved by methane deposited on the surface from strong but infrequent rainstorms. A bright channel may be dry, with the rough riverbed of icy particles (like those seen at the Huygens Landing Site) producing the radar brightness. The darker channels in this image resemble the dry lakes seen in the North Polar area of Titan, so they may be dry as well, with their smoother (radar-dark) surfaces caused by finer-grained sediment deposits on the channel floors.
This image shows an area located at 15° South Latitude and 121° West Longitude. It is about 450 Km (about 280 miles) across, and has approximately 1 Km (0,62-mile) resolution.
North is up.MareKromiumAgo 09, 2008
|
|
Titan-Clouds-North_Polar_Clouds-PIA10434.jpgPolar Clouds on Titan (IR View - False Colors; credits: Lunexit)107 visiteCaption NASA:"Frigid Titan continues to prove itself a remarkably complex and dynamic world. Here, bright clouds are seen encircling the moon's North Polar Region.
The Cassini Spacecraft has revealed the presence of great lakes and seas of liquid hydrocarbons on this part of Titan's surface (see PIA08365 and PIA08930).
An extended, high-altitude haze hovers above the limb of Titan at top of the image.
The image was taken with the Cassini Spacecraft narrow-angle camera on April 26, 2008 using a spectral filter sensitive to wavelengths of Infrared Light centered at 938 nanometers. The view was acquired at a distance of approx. 786.000 Km (such as about 488.000 miles) from Titan.
Image scale is roughly 5 Km (a little more than 3 miles) per pixel".MareKromiumLug 30, 2008
|
|
Titan-PIA10418.jpg"Banded" Planet87 visiteCaption NASA:"This Cassini Spacecraft view of Titan shows banding in the Atmosphere of the moon's Northern Hemisphere. Like the planet Venus, Titan's atmosphere rotates faster than its surface, a characteristic called "Super-Rotation."
North on Titan is up.
White specks seen on Titan are artifacts of the process used to enhance features in the moon's Atmosphere. The image was taken in visible blue light with the Cassini Spacecraft wide-angle camera on May 28, 2008. The view was obtained at a distance of approx. 185.000 Km (such as about 115000 miles) from Titan and at a Sun-Titan-Spacecraft, or Phase, angle of 89°.
Image scale is roughly 11 Km (about 7 miles) per pixel".MareKromiumLug 05, 2008
|
|
Titan-N00112025.jpgUnknown Object in the Space of Titan (additional process. and color. by Lunexit)76 visiteTutti noi sappiamo riconoscere lo "streak" lasciato su un frame dal transito di un Raggio Cosmico (ormai gli esempi sono migliaia).
In questo caso, come ben si vede nell'inset (un extra-detail mgnf), l'oggetto luminoso evidenzia una "testa", una "coda" e quindi lascia anche intuire una "scia più debole - che si diparte dalla fine della "coda" e che è caratterizzata da perdita di materiale" (o da "scorie" di un qualche tipo).
Un bolide, forse.
Molto probabilmente un O.V.N.I. e, sicuramente, NON un Raggio Cosmico.MareKromiumGiu 17, 2008
|
|
Titan-Mountains-PIA10654.jpgTitanian Tectonics - radio-image; credits: NASA58 visiteOvviamente la "linea" è un ovvio image-artifact, come la NASA stessa ci riferisce e spiega NELLE ULTIME DUE RIGHE DEI COMMENTI UFFICIALI, ma noi abbiamo lasciato la sovraimpressione "evocativa di Mistero" sul frame al SOLO scopo di farVi capire - caso mai ce ne fosse stato ancora bisogno - QUANTO SIA FACILE CREARE BUFALE!
Soprattutto allorchè NON si presta la dovuta attenzione alle note "ufficiali" di commento ed allorchè non si è molto familiari con la Fotografia Spaziale in generale e con le Radio-Immagini in particolare.
Caption NASA:"A set of three parallel ridges was seen by the Cassini Spacecraft's Radar Instrument during the latest Titan flyby on May 12, 2008. This combination is unlikely to be a coincidence -- the best explanation for these features is that they are tilted or separated blocks of broken or faulted crust, now exposed as high ridges. Their regular spacing is typical of regions that have been compressed or extended over large areas; as an example, the western United States Basin and Range Province was formed by extension. Such interactions are called "Tectonics", although they do not happen in the same way as plate tectonics, which is a process unique to Earth.
The ridges, which appear on the left side of the image, are rugged features and are elevated above surrounding terrain. The brightness patterns mean that the materials are fractured or blocky at the radar wavelength (2,17 cm, or about 1" - one inch). Along the south sides of the ridges are prominent cliffs, or scarps, present as thin, radar-dark lines trending West-to-East, and interpreted as faults.
These features are dark due to shadowing from the radar illumination, and have heights up to a few hundred meters (several hundred feet), based on preliminary estimates of slopes.
The area shown here is located in the mountainous region called Xanadu.
The ridges are similar in many ways to mountain chains seen at similar latitude but about 90° to the West, just West of Shangri-La (observed during a flyby in October 2005, and showin a Sea of Sand-like Dunes).
Both Regions have mountain chains or ridges that are oriented West-to-East and are spaced about 50 Km (or about 30 miles) apart. This indicates tectonic forces have acted in a North to South direction at Titan's Equatorial Region and have resulted in regular effects in Titan's crust, evidence that will help scientists better understand Titan's crust and interior.
Other linear features, probably related to the formation of the ridges, and circular features, perhaps eroded impact craters now filled with radar-dark (smooth) material, are also seen in the image. The largest circular feature, at bottom center, is about 20 Km in diameter.
The image is centered at 2° South Lat. and 127° West Long. and was obtained on May 12, 2008, with a resolution of about 300 meters (980 feet). The open arrow indicates the direction of radar illumination.
The dashed white line in the upper portion is an artifact of the SAR processing and will be removed in later versions".MareKromiumMag 24, 2008
|
|
| 426 immagini su 36 pagina(e) |
|
|
|
|
|
17 | |
|
|
|
|
|
|
