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OPP-SOL1028-1N219449942EFF77O1P1987R0M1.jpgThe flat surface of Meridiani (3)57 visitenessun commento
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OPP-SOL1028-1N219449814EFF77O1P1987L0M1.jpgThe flat surface of Meridiani (2)57 visitenessun commento
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OPP-SOL1028-1N219449726EFF77O1P1987R0M1.jpgThe flat surface of Meridiani (1)57 visitenessun commento
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Aurora_Borealis_-_01.jpgRed Space-Waterfall57 visitenessun commentoMareKromium
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as17-147-22452.jpgAS 17-147-22452 - CSM America from LM Challanger57 visitenessun commentoMareKromium
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as17-147-22480.jpgAS 17-147-22480 - South Massif57 visiteNota: è una nostra impressione oppure il "South Massif" Lunare assomiglia davvero in maniera incredibilme alla "Husband Hill" Marziana?!?MareKromium
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as17-147-22492.jpgAS 17-147-22492 - My VERY long shadow (Jack Schmitt's shadow)...57 visitenessun commentoMareKromium
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The_Rings-PIA08827.jpgMimas and the Rings57 visiteCaption NASA:"A recently discovered diffuse ringlet shines brightly in the Cassini Division as Mimas cruises past at bottom. Most of the main Rings are comprised of particles ranging from marble-size to house-size. In contrast, the brightness of this ringlet (seen right of center) when viewed at a high phase angle (the Sun-Saturn-Spacecraft angle) indicates it contains a large quantity of microscopic particles, which were likely generated by the disruption of a larger body. Such an event was probably recent, since this ringlet was not observed by the Voyager spacecraft in 1980 and 1981.
This view looks toward the lit side of the Rings from about 1° below the Ring-Plane. Mimas, which is in the foreground between Cassini and the Rings, is 397 Km (about 247 miles) wide. See PIA08330 and PIA08331 for other views of the new ringlet.
The image was taken in visible light with the Cassini spacecraft wide-angle camera on Nov. 18, 2006 and from a phase angle of 140°. Cassini was then at a distance of about 1,2 MKM (about 800.000 miles) from Saturn. Image scale is roughly 7 Km per pixel".MareKromium
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Terra_Sirenum-PIA09101-01.jpgSeasonal frost in Terra Sirenum (according to Lunexit)57 visitenessun commentoMareKromium
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Enceladus-PIA09037.jpgActive Enceladus57 visiteOn Nov. 9, 2006, Cassini's Composite Infrared Spectrometer captured its first view of the Infrared Heat Radiation emanating from the "Tiger Stripe" fractures at the South Pole of Saturn's moon Enceladus (right) since the discovery of the hot spot 16 months earlier (left). The original discovery was made just before a close flyby of Enceladus on July 14, 2006, and coincided with the discovery of plumes of water-rich gas and ice particles jetting out of the Tiger Stripes. However, the spacecraft's orbit did not provide any good views of the South Pole for follow-up observations until November 2006.
The new observations were made from a range of 110.000 Km (68.350 miles), slightly more distant than the 80.000-Km range (49.700 miles) of the original observations.
Comparison of the two images shows that the South Polar Region continues to be active, and the distribution of temperatures there has changed little in 16 months.
The distribution of Heat Radiation suggests that most or all of the South Polar heat comes from the Tiger Stripes themselves, though the individual stripes are not resolved at the approximate 30-Km (19-mile) spatial resolution of these images.
The images show the intensity of Heat Radiation in the 10- to 16-micron wavelength range, translated into temperature and displayed in false color.
Peak South Polar temperature on both dates reached about 85 Kelvin (- 306 degr. Fahrenheit), averaged over the 30-Km (19-mile) spatial resolution of the data. However, the variation in brightness with wavelength, which is also measured by the Composite Infrared Spectrometer, reveals that the warm region includes small areas, possibly zones a few 100 mt (320 feet) wide along the length of the Tiger Stripes, that are at higher temperatures, reaching at least 130 Kelvin (- 225 degr. Fahrenheit) and perhaps much warmer still.
While the South Polar Tiger Stripes are almost certainly heated by energy from the moon's interior, daytime regions at low latitudes are warmed by sunlight to temperatures in the high 70s Kelvin (about - 320 degrees Fahrenheit).
The white numbers on the images show West Longitudes on Enceladus, which is 500 Km (310 miles) in diameter.
The dashed line shows the Terminator, the boundary between day and night.
The blotchy appearance of the cooler regions away from the South Pole, and of the sky beyond the globe of Enceladus, is an artifact resulting from the fact that apart from the Polar Hot Spot, the Composite Infrared Spectrometer can barely detect the very faint Heat Radiation from this very cold moon.MareKromium
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The_Rings-PIA08840.jpgThe Main Ring-System57 visiteCaption NASA originale:"This expansive view takes in most of Saturn's main Ring System, from the outer C-Ring to the narrow and knotted-looking F-Ring. The broad brightness plateaus in the C-Ring (at bottom) transform into the more densely populated (and thus darker in this viewing geometry) B-Ring. The Rings' appearance becomes brighter and smoother beyond the bands of the Cassini Division, in the A-Ring. This view looks toward the unlit side of the Rings from about 49° above the Ring-Plane.
The image was taken in visible blue light with the Cassini spacecraft wide-angle camera on Nov. 21, 2006 at a distance of approx. 539,000 Km (about 335.000 miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 98°.
Image scale is 29 kilometers (18 miles) per pixel".MareKromium
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Titan-PIA08351.jpgClose "Friends"...57 visiteCaption NASA originale:"Cassini peers around the hazy limb of Titan to spy the sunlit South Pole of Saturn in the distance beyond.
The thick, smog-like atmosphere of frigid Titan is a major source of interest for the Cassini mission. The moon is 5.150 Km (about 3.200 miles) across.
Images taken using red, green and blue spectral filters were combined to create this natural-color view. The image was taken with the Cassini spacecraft narrow-angle camera on Dec. 26, 2005, at a distance of approx. 26.000 Km (about 16.000 miles) from Titan. Image scale is roughly 1 Km (4.643 feet) per pixel".
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