| Ultimi arrivi - SOLAR SYSTEM |
Jupiter-PIA21974.jpgWhat a View!169 visitenessun commentoMareKromium%04 %402 %2020
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Jupiter-PIA23442.jpgOn the Limb...144 visiteCaption NASA Originale:"NASA's Juno spacecraft captured this impressive image revealing a band of swirling clouds in Jupiter's Northern Latitudes during Juno's close fly-by occurred on November, 3, 2019. Small pop-up storms can also be seen rising above the lighter areas of the clouds, most noticeably on the right side of the image.
This view provides scientists with high-resolution details the spacecraft skimmed approximately 3.200 miles (such as about 5.149,9 Km) above Jupiter's cloud tops at the time it was taken.
Citizen scientist Bjrn Jnsson created this enhanced color image using data from the JunoCam camera. The picture, as we wrote above, was taken on November, 3, 2019 at 2:13 p.m. PST (5:13 p.m. EST) at a Latitude of about 38 North".MareKromium%04 %401 %2020
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Jupiter-PIA23606.jpgThe "Eye" of Jupiter154 visiteCaption NASA Originale:"Swirling in Jupiter's Atmosphere for hundreds of years, the Great Red Spot is captured in this pair of close-up images from Juno's JunoCam Camera. The giant storm churns through Jupiter's Atmosphere, creating the turbulent flows to its West. On the West-side of the Great Red Spot itself, a sliver of red material is being pulled off the periphery. This is a recent, frequent, phenomenon first observed in ground-based data in 2017.
Two images have been mosaicked together by citizen scientist Kevin M. Gill to create this enhanced color composite. When they were taken on Feb. 12, 2019 at 10:24 a.m. PDT (1:24 p.m. EDT) and 10:29 a.m. PDT (1:29 p.m. EDT), Juno was about 43.500 miles (such as about 70.006,464 Km) above Jupiter's cloud tops. Features as small as 31 miles (approx. 49,889 Km) can be resolved in the images, allowing us to see structure in the interior of the Great Red Spot, as well as the fine texture of the white clouds in the South Tropical Zone below".MareKromium%04 %400 %2020
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Jupiter-PIA23437.jpgIo's Shadow160 visiteCaption NASA Originale:"Jupiter's volcanically active moon Io casts its shadow on the planet in this dramatic image from NASA's Juno Spacecraft. As with solar eclipses on the Earth, within the dark circle racing across Jupiter's cloud tops one would witness a full solar eclipse as Io passes in front of the Sun.
Such events occur frequently on Jupiter because it is a large planet with many moons. In addition, unlike most other planets in our solar system, Jupiter's axis is not highly tilted relative to its orbit, so the Sun never strays far from Jupiter's equatorial plane (+/- 3). This means Jupiter's moons regularly cast their shadows on the planet throughout its year.
Juno's close proximity to Jupiter provides an exceptional fish-eye view, showing a small fraction near the planet's Equator. The shadow is about 2.200 miles (such as approx. 3.540,55 Km) wide, approximately the same width as Io, but appears much larger relative to Jupiter.
A little larger than Earth's Moon, Io is perhaps most famous for its many active volcanoes, often caught lofting fountains of ejecta well above its thin (?) Atmosphere.
Citizen scientist Kevin M. Gill created this enhanced-color image using data from the spacecraft's JunoCam imager. The raw image was taken on Sept. 11, 2019 at 8:41 p.m. PDT (11:41 p.m. EDT) as the Juno spacecraft performed its 22nd close fly-by of Jupiter. At the time the image was taken, the spacecraft was about 4.885 miles (approx. 7.861,64 Km) from the cloud tops at a Latitude of 21 North".
Nota: e per chi ha visto il famoso "2010 Odissea Due: l'Anno del Contatto", questa immagine dovr "ricordare" qualcosa...MareKromium%04 %399 %2020
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Titan-PIA21890.jpgTitan114 visiteCaption NASA Originale:"As it glanced around the Saturn system one final time, NASA's Cassini Spacecraft captured this view of the planet's giant moon Titan. Interest in mysterious Titan was a major motivating factor to return to Saturn with Cassini-Huygens following the Voyager mission fly-bys of the early 1980s. Cassini and its Huygens probe, supplied by the ESA (European Space Agency), revealed the moon to be every bit as fascinating as scientists had hoped.
These views were obtained by Cassini's Narrow-Angle Camera on Sept. 13, 2017. They are among the last images Cassini sent back to Earth.
This natural color view, made from images taken using red, green and blue spectral filters, shows Titan much as Voyager saw it - a mostly featureless golden orb, swathed in a dense Atmospheric Haze. An enhanced-color view (such as this one) adds to this color a separate view taken using a spectral filter (centered at 938 nanometers) that can partially see through the haze.
The views were acquired at a distance of about 481.000 miles (such as approx. 774.094,464 Km) from Titan. The image scale is about 3 miles (roughly 4,828 Km) per pixel".MareKromium%12 %652 %2020
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Saturn-PIA21899.gifPolar Lights (Auroral Emissions from the North Pole of Saturn)111 visiteCaption NASA Originale:"On Sept. 14, 2017, one day before making its final plunge into Saturn's Atmosphere, NASA's Cassini Spacecraft used its Ultraviolet Imaging Spectrograph, or UVIS, instrument to capture this final view of Ultraviolet Auroral Emissions over the Planet's North Polar Regions.
The view is centered on the North Pole of Saturn, with lines of Latitude visible for 80, 70 and 60. Lines of Longitude are spaced 40 apart. The Planet's Day-Side is at the bottom of the picture, while the Night-Side is at the top. A sequence of images from this observation has also been assembled into a movie sequence. The last image in the movie was taken about an hour before the still image, which was the actual final UVIS auroral image.
Auroral Emissions are generated by charged particles traveling along the invisible lines of Saturn's Magnetic Field. These particles (then) precipitate into the Atmosphere, releasing light when they strike (the) Gas Molecules (that are present) there.
Several individual auroral structures are visible here, despite that this UVIS view was acquired at a fairly large distance from the Planet (such as about 424.000 miles or approx. 682.361,856 Km). Each of these features is connected to a particular phenomenon (occurring) in the Saturnian Magnetosphere. For instance, it is possible to identify Auroral "signatures" here that are related to the injection of "Hot Plasma" from the Day-Side Magnetosphere, as well as Auroral Features associated with a change in the Magnetic Field's shape (existing) on the Magnetosphere's Night-Side.
Several possible scenarios have been postulated over the years to explain Saturn's changing Auroral Emissions, but researchers are still far from a complete understanding of this complicated puzzle. Researchers will continue to analyze the hundreds of image sequences UVIS obtained of Saturn's auroras during Cassini's 13-year mission, with many new discoveries likely to be made.
This image and movie sequence were produced by the Laboratory for Planetary and Atmospheric Physics (LPAP) of the STAR Institute of the University of Liege in Belgium, in collaboration with the UVIS Team".MareKromium%12 %643 %2020
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Titan-PIA21902.jpgThe uneven Atmosphere of Titan136 visiteLe diverse stratificazioni dell'Alta Atmosfera di Titano sono ben visibili in questa foto CASSINI dell'ormai lontano AD 2005.
In questo frame, ci appare del tutto evidente che la densit dell'Atmosfera di Titano NON strettamente correlata all'altezza della stessa (ergo delle sue nuvole e nebbie) rispetto al Datum (Altitudine Zero); le turbolenze (e quindi anche la composizione chimica dell'Atmosfera) sembrano estendersi e rivolgersi, a volte, da strati pi bassi verso quelli pi alti, mentre, in altri casi, sembra avvienire esattamente l'opposto.
Questa conclusione stata basata sull'esame di immagini sequenziali che coprissero la medesima Regione Titaniana per svariati minuti (o decine di minuti). In questo frame le innumerevoli "disomogeneit" sono del tutto palesi.
Non possiamo neppure escludere l'esistenza di (violentissime) correnti convettive le cui cause, tuttavia, non sono ancora chiare.
Caption NASA Originale:"In this view, individual Layers of Haze can be distinguished in the Upper Atmosphere of Titan, Saturn's largest moon. Titan's Atmosphere features a rich and complex chemistry originating from Methane and Nitrogen (---> Azoto) and evolving into complex molecules, eventually forming the "Smog! that surrounds the moon (even at extremely lower altitudes).
This Natural Color image was taken in Visible Light with the Cassini Spacecraft wide-angle camera on March 31, 2005, at a distance of approximately 20.556 miles (such as about 33.081,67 Km) from Titan. The view looks toward the North Polar Regions on the moon's Night-Side. Part of Titan's sunlit crescent is visible at right (Dx).
The Cassini Spacecraft ended its mission on Sept. 15, 2017".MareKromium%12 %621 %2020
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016-1-Ceres-Occator-Black_Shadow-01.jpgDark "Spot" inside Occator Crater (CTX Frame)115 visiteMareKromium%09 %637 %2020
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017-1-Ceres-Occator-Black_Shadow-02.jpgDark "Spot" inside Occator Crater (EDM)131 visiteMareKromium%09 %637 %2020
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018-1-Ceres-PIA22764.jpgOccator Crater on the Limb...121 visitenessun commentoMareKromium%09 %636 %2020
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020-1-Ceres-PIA22641.jpgUnusually-looking Surface Feature on 1-Ceres106 visiteCaption NASA Originale:"This image was obtained by NASA's Dawn Spacecraft on July 17, 2018 from an altitude of about 25 miles (such as approx. 40,23 Km).
The center of this picture is located at about 31,0 South Latitude and 248,9 East Longitude".MareKromium%09 %636 %2020
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021-1-Ceres-Cerealia_Facula-Occator_Crater-PIA21924.jpgCerealia Facula109 visiteCaption NASA Originale"This mosaic of Cerealia Facula is based on images obtained by NASA's Dawn Spacecraft in its second extended mission, from an altitude as low as about 21 miles (such as approx. 33,79 Km). The contrast in resolution obtained by the two phases is visible here, reflected by a few gaps in the high-resolution coverage. This image is superposed to a similar scene acquired in the low-altitude mapping orbit of the mission from an altitude of about 240 miles (i.e. approx. 386,24 km).
The increased resolution afforded by the low altitude is revealing intimate details about the relationships between bright and dark materials across the Facula (---> Bright Spot), which will help resolve the mystery of its origin.
Cerealia Facula is located at about 19,7 North Latitude and 239,6 East Longitude".MareKromium%09 %635 %2020
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