| Piú votate - The Universe Inside |
VENUS___SUN_3.jpgVenus and the Sun142 visiteMa c'è dell'altro: la temperatura superficiale del Pianeta è stabile attorno ai 900° F (pari a circa 480/90° C); la pressione al suolo è circa 90 volte maggiore di quella Terrestre al livello del mare e, ultimo ma non meno importante dato, il Pianeta è quasi costantemente innaffiato da una pioggia corrosiva a base di Acido Solforico (H2SO4, per gli amanti delle formulette...).
E' a causa di queste condizioni di estrema ostilità che tutte le Missioni finalizzate ad un landing su Venere sono, almeno con la tecnologia sino ad oggi in nostro possesso, destinate all'insuccesso anche se, a dire il vero, ben 4 Sonde Sovietiche - Venera 9, 10, 13 e 14 - riuscirono a scendere sul Pianeta e, prima di perire, furono comunque capaci di inviarci qualche prezioso fotogramma. 
(18 voti)
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Sunset-PCF-00.jpgSunset from Legnano (Natural Colors; credits: Dr Paolo C. Fienga)208 visitenessun commento
(31 voti)
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Polygons.jpgMartian Polygons (by Michael Hager)117 visitenessun commentoMareKromium
(6 voti)
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ZA-Green flash from the Sun.jpgAnother "green flash" from the Sun (Finland)149 visiteThe same phoenomenon represented by the previous picture.
(28 voti)
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Pseudo-Crater.jpgPseudo-Crater <-- or --> True-Crater154 visite"...Laddove non c'è Verità non ci può neppure essere Bellezza..."
P.C. Floegers
(25 voti)
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Jupiter_and_Europa.jpgFather and Son (by Roberto Tremolada)81 visitenessun commentoMareKromium
(5 voti)
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ZA-Green flash from the Sun (2).jpgA "Green Flash" from the Sun (Portugal)99 visiteCaption NASA originale: "Many think it is just a myth. Others think it is true but its cause isn't known. Adventurers pride themselves on having seen it. It's a green flash from the Sun. The truth is the green flash does exist and its cause is well understood. Just as the setting Sun disappears completely from view, a last glimmer appears startlingly green. The effect is typically visible only from locations with a low, distant horizon and lasts just a few seconds".
(24 voti)
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ALANBEAN-LUNARROVER.jpgLunar "Grand Prix"80 visiteApollo 16 Commander John Young is putting the Lunar Rover through a full test. This was the second mission with the Rover onboard and this Lunar Grand Prix would allow John to evaluate the performance of the Rover in the light gravity and the dusty, cratered, and rocky surface of the Moon.
His companion, Charlie Duke, is photographing it all with the 16-mm Data Acquisition Camera normally mounted on the Rover, but hand-held temporarily to document the Rover motion.
John later said:"The tendency was to drive wide open or very close to that and take what you got. The best reference to speed control was the speedometer, as I really didn't have a feel for the difference between 7 and 10 Km per hour."
Later, he demonstrated a sharp turn at ax speed, about 10 Km per hour. I made the Rover end break out to show the engineers how it looked.
It is no problem as all I had to do was cut back like I do when driving in snow...I didn't get up to any great speed, maybe 10 clicks at the most, but the terrain around there was too rough and rocky for that kind of foolishness..."
Charlie, who was filming it all, told Houston, "...man, Indy has never seen a driver like this."
(14 voti)
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Moon and Companions.jpgMoon & Friends, from Great Salt Lake - Utah (USA)176 visiteDa "NASA - Picture of the Day" del 13 Settembre 2005:"(...) This busy quadruple 'coincidence sky' was visible last week all over the World. The easiest object to spot is the crescent Moon, which is easily the brightest sky orb in the above image. Venus is the highest Planet in the sky, with Jupiter to its right. The bright star Spica completes the quadruple just below Venus. The 'streak' on the far right is an airplane. (...)".
Nota: osservate lo "streak in the sky" lasciato dall'aeroplano (come la NASA stessa precisa) e poi provate a riguardare l'immagine Spirit relativa allo "Streak in the Sky" che alla NASA (ed anche in Italia, grazie al Corsera ed al Dr Caprara) venne immediatamente risolto come "vecchia sonda che precipita" (cfr.: "Another Spirit in the Sky?!?" - Sez. "Mars Spirit Anomalies and Maps"). Bene, allora se tanto ci dà tanto, vorremmo chiedere alla NASA "quale sonda - ripresa dal Sig. Wilson - stava precipitando nei cieli dello Utah, la sera del 6 Settembre u.s.?".
E scusateci l'ironia...
(16 voti)
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Venus Belt.jpgThe "Belt of Venus"163 visiteCaption originale NASA da "Astronomy Picture of the Day" del 27 Gennaio 2005:"A nearly full Moon and planet Earth's shadow set together in this scene captured from snowy Mt. Jelm, home of the Wyoming Infrared Observatory. For early morning risers (and late to bed astronomers), shadow set in the western sky is a daily apparition whose subtle beauty is often overlooked in favor of the more colorful eastern horizon. Extending through the dense atmosphere, Earth's setting shadow is seen in this picture as a "dark blue band" along the distant horizon, bounded above by a pinkish glow or antitwilight arch. Also known as the "Belt of Venus", the arch's lovely color is due to backscattering of reddened light from the rising Sun. The setting Moon's light is also reddened by the long sight-line through the atmosphere and echoes the dawn sky's yellow-orange hues".
Allora: che ne dite della "Cintura di Venere"? Affascinante, vero?!?...
(16 voti)
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Aurora Borealis.jpgAurora over Wisconsin116 visiteLo "spettacolo" delle Aurore Boreali che stanno manifestandosi un pò ovunque in Nord America non accenna a diminuire: questa si è 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...
(19 voti)
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ALANBEAN-MOTHEREARTH.jpgMother Earth118 visitenessun commento
(15 voti)
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