| Piú votate - The Universe Inside |
The_Moon.jpgThe Hunter's Moon...68 visite"...Caelum, avarus, in coeno quaerit..."
(Binder)
"...L'avaro (inteso anche come chi è "moralmente misero") cerca il Cielo nel fango..."MareKromium
(15 voti)
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Voyagers-01.gifTowards the "Terra Incognita" (2)94 visiteIt is appropriate to consider the VIM as three distinct phases: the termination shock, heliosheath exploration, and interstellar exploration phases. The two Voyager spacecraft began the VIM operating, and are still operating, in an environment controlled by the Sun's magnetic field with the plasma particles being dominated by those contained in the expanding supersonic solar wind. This is the characteristic environment of the termination shock phase. At some distance from the Sun, the supersonic solar wind will be held back from further expansion by the interstellar wind. The first feature to be encountered by a spacecraft as a result of this interstellar wind/solar wind interaction will be the termination shock where the solar wind slows from supersonic to subsonic speed and large changes in plasma flow direction and magnetic field orientation occur.
Passage through the Termination Shock ends the Termination Shock Phase (TSP) and begins the Heliosheath Exploration Phase (HEP). Voyager 1 in 2004 completed the TSP of the mission when the spacecraft was 94 AU from the Sun. After passage through the Termination Shock, the spacecraft will be operating in the Heliosheath environment which is still dominated by the Sun's Magnetic Field and particles contained in the Solar Wind. The HEP ends with passage through the Heliopause which is the outer extent of the Sun's Magnetic Field and Solar Wind. The thickness of the Heliosheath is uncertain and could be tens of AU thick taking several years to traverse. Passage through the Heliopause begins the Interstellar Exploration Phase (IEP) with the spacecraft operating in an interstellar wind dominated environment. This interstellar exploration is the ultimate goal of the Voyager Interstellar Mission.MareKromium
(15 voti)
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CloudsandStars.jpgIn the twilights...68 visitenessun commentoMareKromium
(15 voti)
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M-45~0.jpgM 45 and Venus81 visite"...L'Opium agrandit ce qui n'a pas de bornes,
Allonge l'Illimité,
Approfondit le Temps, creuse la Volupté,
Et de plaisirs noirs et mornes
Remplit l'ame au-delà de sa capacité..."
Charles Baudelaire (1821 - 1867) - "Le Poison" (1857)
(15 voti)
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Polar Flash.jpgPolar "Flash"78 visitenessun commento
(15 voti)
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In the Mind-1.jpgIn the mind99 visitenessun commento
(15 voti)
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Tomorrow.jpgTomorrow never dies...85 visitenessun commento
(15 voti)
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SN 1006-1.jpgSN 1006: A New Sun over the Ocean...90 visite...Si tratta soltanto di una - riuscita - ricostruzione/falsificazione, ma il risultato finale è comunque molto bello e ci dimostra, una volta ancora, che se si è capaci di "giocare" con le immagini, si può creare qualsiasi cosa e si può ingannare chiunque...
Caption originale:"A new star, likely the brightest supernova in recorded human history, appeared in planet Earth's sky about 1000 years ago, in 1006 AD. The expanding debris cloud from the stellar explosion is still visible to modern astronomers, but what did the supernova look like in 1006? In celebration of the millennial anniversary of SN1006, astronomer Tunc Tezel offers this intriguing suggestion, based on a photograph he took on February 22, 1998 from a site overlooking the Mediterranean Sea, south of Antalya, Turkey. On that date, bright Venus and a waning crescent Moon shone in the early morning sky. Adopting calculations which put the supernova's apparent brightness between Venus and the crescent Moon, he digitally superposed an appropriate new star in the picture. He placed the star at the supernova's position in the southerly constellation of Lupus and used the water's reflection of moonlight in the final image".
(15 voti)
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Aurora_Borealis-Coronal_Aurora-sep11aurora_moussette_f.jpgNorthern Lights over Canada69 visiteSo far, the Aurora Borealis - or "Northern Lights" - have made some remarkable visits to September's Skies. The reason, of course, is the not-so-quiet Sun. In particular, a large solar active region now crossing the Sun's disk has produced multiple, intense flares and a large Coronal Mass Ejection (CME) that triggered wide spread auroral activity just last weekend. This colorful example of spectacular curtains of aurora was captured with a fish-eye lens in skies over Quebec, Canada, on September 11, 2005.
Also featured is the planet Mars, the brightest object above and left center. Seen near Mars (just below and to the right) is the tightly knit Pleiades star cluster.
Although they can appear to be quite close, the Northern Lights actually originate at extreme altitudes, 100 Km or so above the Earth's surface.
(15 voti)
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Sunrise.jpgCrepuscular Rays Over Utah78 visiteDa "NASA - Picture of the Day", del 31 Agosto 2005:"What could cause such rays of dark? Dark sky rays were caught in spectacular fashion earlier this month above Utah, USA. The cause is something surprisingly familiar: shadows. Clouds near the horizon can block sunlight from reflecting off air, making columns outward from the Sun appear unusually dark. Cloud shadows can be thought of the complement of the more commonly highlighted crepuscular rays, also visible above, where sunlight pours though cloud holes. Sometimes, on the opposite side of the sky, anticrepuscular rays can also be seen".
(15 voti)
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ZZ-ZZ-ZZ-ZZ-ZZ-LunarGreenFlash_laveder_f.jpgA "green flash" over the Moon133 visiteDa "NASA - Picture of the Day" del 26 Agosto 2005:"July's Full Moon looks strangely darkened and distorted in this remarkable telescopic view. The image is one of a series recorded when the Moon was very near the horizon. The long sight-line through a turbulent atmosphere gives rise to the tantalizing optical effects, including the thin "mirage" shape that seems to float just above the Moon's upper edge. Also seen (more easily in the inset), along the Moon's upper edge is a noticeable green rim. Substantial atmospheric refraction produces this prism-like effect -- related to the more commonly witnessed green flash of the setting Sun. Careful inspection of the full image reveals a corresponding red rim along the lower edge, another intriguing signature of atmospheric refraction".
(15 voti)
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Sun pillar.jpgAnother light Sun Pillar88 visitenessun commento
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