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Alpha-Orionis-1600.jpgSetting Alpha Orionis172 visite
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AlphaCentauriOne.pngUnder Alpha Centauri...82 visitenessun commentoMareKromium
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Anti-Crepuscular_Rays_1024.jpgAnticrepuscular Rays over Sicily (Image Credit & Copyright: Marcella Giulia Pace - Text: Cecilia Chirenti (NASA GSFC, UMCP, CRESST II)182 visiteThe Sun has just set... in the opposite side of the sky. Pictured here are anticrepuscular rays apparently converging in the east in this image of the limestone plateau in the heart of the Hyblaean Mountains of southeastern Sicily, in Italy. How were these anticrepuscular rays formed, if the Sun wasn't there? After the Sun set (in the west, as usual) its light still illuminated a cloud higher up in the sky. Partially blocked by the cloud, the sunlight produced patterns of light and shadow, crossing the sky in parallel lines. Perspective makes it look like they converge in the east, in the same way that train tracks appear to meet in the distance. This effect can also happen at sunrise, only the directions are exchanged. In rare cases, both crepuscular and anticrepuscular rays can be seen at the same time.MareKromium
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Apollo_Class.jpgApollo Class134 visite"La Verità non è mai visibile. E' solo un'idea. Ed un'idea la si può vedere?!?"
Paolo C. FiengaMareKromium
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Arcobaleno-4.pngNature is Art! (by Dott.ssa Tatiana Balbiani)412 visiteTanto vero, quanto incommentabile. Anzi, si: Meraviglioso!MareKromium
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Aurora Borealis - Norway.jpgBlack Aurora over Norway92 visiteDa "NASA - Picture of the Day" del 29 Marzo 2006:"What causes gaps between aurora curtains? These unusual gaps can make auroral displays appear more detailed and intricate. Research using data from four Cluster Spacecraft orbiting the Earth has likely found the secret: auroral gaps, sometimes knows as "black auroras", are actually anti-auroras. In normal auroras, electrons and/or predominantly negatively charged particles fall toward Earth along surfaces of constant magnetic field. They ionize the Earth's atmosphere on impact, causing the bright glows. In auroral gaps, however, negatively charged particles may be sucked out from the Earth's ionosphere along adjoining magnetic field lines. These dark anti-auroras can climb to over 20.000 Km and last for several minutes. Pictured above, a series of well-defined auroral gaps is seen dividing green aurora curtains high above Harstad, Norway, earlier this month".
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Aurora Borealis.jpgAurora over Wisconsin118 visiteLo "spettacolo" delle Aurore Boreali che stanno manifestandosi un p ovunque in Nord America non accenna a diminuire: questa si verificata nel Wisconsin. Ecco la caption originale da "NASA - Picture of the Day" del 17 Novembre 2004:"The auroral displays of the past week are being reported as some of the most beautiful in memory. In particular, impressive auroral bands fanned out over much of eastern North America after sunset on November 8. The multicolored aurora pictured above was caught reflecting in one of the many small lakes in central Wisconsin near that time. Continued solar activity might create more aurora visible over the next few nights as the Leonids meteor shower peaks". Non comprendiamo, a dire il vero, la curiosa relazione implicita che ci sembra essere stata fatta tra il verificarsi di queste Aurore ed i prossimo picco delle Leonidi.
Forse non abbiamo capito bene o magari ci sta semplicemente sfuggendo qualcosa...
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Aurora Borealis~0.jpgAurora Borealis over North Dakota87 visiteDa "NASA - Picture of the Day" del 20 Novembre 2005:"This aurora was a bit of a surprise. For starters, on this Friday morning in August 2002, no intense auroral activity was expected at all. Possibly more surprising, however, the aurora appeared to show an usual structure of green rays from some locations. In the above image, captured from North Dakota, USA, a picket fence of green rays stretches toward the horizon. Mirroring the green rays is a red band, somewhat rare in its own right. Lights from the cities of Bismarck and Mandan are visible near the horizon. Large sunspot groups indicate that activity from an active Sun is relatively likely, possibly causing other streams of energetic particles to cascade onto the Earth and so causing more auroras".
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Aurora.jpgGreen Aurora94 visiteDa "NASA - Picture of the Day" del 6 Settembre 2006:"What if your horizon was green? If you've got a camera, take a picture! That was the experience of Jeff Hapeman last week when visiting the Pictured Rocks National Lakeshore in Michigan. On a quiet night toward the Northern Horizon over Lake Superior was a long lasting diffuse green aurora. The above image was taken in an effort to capture the sense of wonder one gets when watching an auroral display. Auroras are sparked by energetic particles from the Sun impacting the magnetic environment around the Earth. Resultant energetic particles such as electrons and protons rain down near the Earth's poles and impact the air. The impacted air molecules temporarily lose electrons and when oxygen molecules among them reacquire these electrons, they emit green light. Auroras are known to have many shapes and colors".
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AuroraBorealis-Alaska.jpgAurora over Alaska84 visiteCaption NASA:"Higher than the highest mountain, higher than the highest airplane, lies the realm of the aurora. Aurora rarely reach below 60 Km, and can range up to 1000. Aurora light results from solar shockwave causing energetic electrons and protons to striking molecules in the Earth's atmosphere. Frequently, when viewed from space, a complete aurora will appear as a circle around one of the Earth's magnetic poles. The above digitally enhanced photograph was taken in 2005 January shows a spectacular aurora borealis above the frozen landscape of Bear Lake, Alaska, USA.
The above image was voted Wikipedia Commons Picture of the Year for 2006".
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AuroraTree_Wallace_960.jpgThe Aurorae Tree (Image Credit & Copyright: Alyn Wallace)149 visiteDeath Will Come And Will Have Your Eyea
Death will come and will have your eyes.
This death that accompanies us
From morning to night, sleepless,
Deaf, like an old remorse,
Or an absurd vice.
Your eyes will be a vain word,
A silent cry, a silence.
This is how you see them every morning,
When you bend over yourself alone,
In the mirror.
O dear Hope,
That day we too will know
That you are life and you are nothing.
Death has a gaze for everyone.
Death will come and will have your eyes.
It will be like giving up a vice,
Like seeing in the mirror,
Reemerging, a dead face.
Like listening to a closed lip.
And we will descend, into the whirlpool, silent.
(Cesare Pavese, March 22, 1950)
MareKromium
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Aurora_Borealis-2.jpgAurora Borealis over Juneau72 visiteCaption NASA:"Some auroras can only be seen with a camera. They are called sub-visual and are too faint to be seen with the unaided eye. The reason is that the human eye only accumulates light for a fraction of a second at a time, while a camera shutter can be left open indefinitely. When photographing an already picturesque scene above Juneau, Alaska, USA, a camera caught green sub-visual aurora near the horizon. Auroras are sparked by energetic particles from the Sun impacting the magnetic environment around the Earth. Resultant energetic particles such as electrons and protons rain down near the Earth's poles and impact the air.
The impacted air molecules temporarily lose electrons, and when oxygen molecules among them reacquire these electrons, they emit green light. Auroras are known to have many shapes and colors". MareKromium
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