| Risultati della ricerca nelle immagini - "vision" |
The Rings-PIA07616.jpgThe "Cassini" Division (close-up)76 visiteOriginal caption:"The outer reaches of Saturn's Cassini Division merges with the inner A-Ring (at the right) in a Region that is rich in structure.
The smooth Region leading up to the A-Ring grows brighter from the left to the right (known as a "ramp" to Ring).
This Region contains a faint "double-wave" structure that is a density feature caused by the influence of the co-orbital moons Janus and Epimetheus. Scientists are interested in observing the evolution of this density wave as the moons swap places in their orbits every few years, presumably resulting in a change in the perturbations that cause this feature.
This image was taken in visible light with the Cassini narrow-angle camera on Sept. 5, 2005, at a distance of approx. 441.000 Km (about 274.000 miles) from Saturn. The image scale is 2 Km (a little more than 1 mile) per pixel".
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The_Rings-PIA08306.jpgThe A and B-Rings (and the Cassini Division) in natural colors (Credits: NASA/JPL/Space Science Institute)60 visiteThe Rings are awash in subtle tones of gold and cream in this view which shows the outer B-Ring, the Cassini Division and the inner part of the A-Ring. In this viewing geometry, the brightest feature in the Cassini Division is the recently discovered diffuse Ringlet near the outer edge of the Division.
The diffuse Ringlet has a distinctive bluish cast.
The color of the Rings appears more golden than earlier in the mission because of the viewing geometry here - increased scattering in the Rings is brought about by the high phase angle and the view being toward the Rings' unlit side. This view looks toward the unlit side of the rings from about 30° above the Ring-Plane.
Images taken using red, green and blue spectral filters were combined to create this natural color view. The images were acquired by the Cassini spacecraft narrow-angle camera on Sept. 29, 2006 at a distance of approx. 1,8 MKM (about 1,13 MMs) from Saturn. Image scale is roughly 11 Km (about 7 miles) per pixel.
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The_Rings-PIA08836.jpgThe Rings' texture53 visiteCaption NASA:"This close-up of the inner edge of the Cassini Division shows an enormous amount of structure, including a grainy texture in the bright outer B-Ring material near the gap edge.
An extreme enhancement of the original image, presented at right, reveals the grainy region with greater clarity.
This view looks toward the lit side of the rings from about 54° below the Ring-Plane.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Nov. 8, 2006 at a distance of approx. 378.000 Km (about 235.000 miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 68°.
Image scale is roughly 2 Km (a little more than 1 mile) per pixel".
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The_Rings-PIA08901.jpgThe "Cassini Division"53 visiteCaption NASA:"The Cassini Division appears to emerge out of Saturn's shadow in this Cassini spacecraft image. This Division between the A and B Rings, visible through modest telescopes from Earth, actually contains five dim bands of ring material, here seen near the left side of the image between two small dark gaps.
This detailed view also displays a great deal of structure in the B-Ring, left of the Division. The Cassini Division is 4800 Km (2980 miles) wide. This view looks toward the unlit side of the Rings from about 59° above the Ring-Plane.
The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 9, 2007 at a distance of approx. 1,7 MKM (about 1,1 MMs) from Saturn.
Image scale is roughly 10 Km (about 6 miles) per pixel".
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ZZ-ZZ-ZZ-InfraredMoon_msx_big.jpgEclipsed Moon in Infrared: what's inside Tycho Crater?1320 visiteDa "NASA - Picture of the Day" del 23 Aprile 2005:"In September of 1996, the Midcourse Space Experiment (MSX) satellite had a spectacular view of a total lunar eclipse from Earth orbit. SPIRIT III, an on board infrared telescope, was used to repeatedly image the moon during the eclipse. Above is 1 of the images taken during the 70 minutes of totality (...). Infrared light has wavelengths longer than visible light - humans can not see it but feel it as heat. So, the bright spots correspond to the warm areas on the lunar surface and dark areas are cooler. The brightest spot below and left of center is the crater Tycho, while the dark region at the upper right is the Mare Crisium".
La spiegazione fornitaci dalla NASA circa il contenuto e la chiave di lettura dell'immagine è davvero perfetta ed inequivocabile. Ciò che ci lascia perplessi, tuttavia, è l'assoluta non-chalance con cui ci viene detto che il Cratere Tycho "è caldo", mentre quasi tutto il resto della Luna non lo è.
Cosa c'è "dentro" Tycho?!?
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ZZ-ZZ-ZZ-NSX-InfraredMoon-Edited.jpgEclipsed Moon in infrared - edited241 visiteUn grazie di cuore - come al solito... - al Dr Alessio Feltri il quale, approfittando della splendida immagine della Luna in infrarosso, coglie l'occasione per mostrarci ed illustrarci, in parallelo, qualcuno dei rilievi visibili più interessanti nonchè le aree di landing delle Missioni Apollo.
Inutile dire che c'è già materiale sufficiente per iniziare a riflettere...
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