| Piú votate - The Universe Inside |
Puzzle-Cook.jpgOne piece after another...57 visite"...Ed alla fine non restano che ricordi.
Sorrisi, lacrime, sensazioni di caldo e di freddo.
L'ultimo - e più prezioso - patrimonio che non potrò mai lasciare in eredità: la mia Memoria..."
P.C. Floegers - "Conversations for Tomorrow"MareKromium
(13 voti)
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Phobos_Eclipsing_Victoria.jpgPhobos eclipsing Victoria Crater's Region (elab. Lunexit)57 visitenessun commentoMareKromium
(13 voti)
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The_Moon_and_Saturn.jpgSo close, and yet, so far...58 visite"...A Verbal Art like Poetry is reflective: it stops to think. Music is immediate: it goes on to become..."
W.H. Auden (1907 - 1973) - "Music and Imagination" (1952)MareKromium
(13 voti)
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Aurora.jpgGreen Aurora71 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".
(13 voti)
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Solstice over Stonehenge.jpgSolstice on Stonehenge75 visiteDa "NASA - Picture of the Day" del 21 Giugno 2006:"Today the Sun reaches its northernmost point in the planet Earth's sky.
Called a "solstice", the date traditionally marks a change of seasons -- from Spring to Summer in Earth's Northern Hemisphere and from Fall to Winter in Earth's Southern Hemisphere. Pictured above is the 2005 Summer Solstice celebration at Stonehenge in England. The event was rare because Stonehenge was not always open to the public, and because recent Summer Solstices there had been annoyingly cloudy.
In 2005, however, thousands of people gathered at sunrise to see the sun rise through the 4000 year old solar monument.
Due to the precession of the Earth's orbital axis over the millennia, the Sun no longer rises over Stonehenge in an astronomically significant way, although the photographer was able to find a good spot where the rising Sun appeared over one of Stonehenge's massive standing stones".
(13 voti)
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Aurora Borealis - Norway.jpgBlack Aurora over Norway73 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".
(13 voti)
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Super-Earths.jpgSuper-Earths?96 visiteda "NASA - Picture of the Day" del giorno 20 Marzo 2006:"Are Super-Earths common around other star systems? Quite possibly. Unexpected evidence for this came to light recently when a planet orbiting a distant star gravitationally magnified the light of an even more distant star. Assuming the planet's parent star is normal red dwarf, the brightening is best explained if the planet is about 13 times the mass of the Earth and orbiting at the distance of the asteroid belt in our own Solar System. Given the small number of objects observed and similar determinations already obtained for other star systems, these super-Earths might be relatively common. Astronomers speculate that the planet might have grown into a Jupiter-sized planet if its star system had more gas. Since the planet was not observed directly, significant uncertainty remains in its defining attributes and future research will be aimed at better understanding this intriguing system (...)".
(13 voti)
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South Polar Halo.jpgSouth Polar Halo57 visiteWhen Sunlight reflects and refracts off of tiny ice crystals in the atmosphere, the result can be ice crystal halos, which are related to rainbows (the latter being produced when Sunlight reflects and refracts from water droplets).
In Antarctica the temperatures are cold and the air is dry, so snow crystals grow very slowly. This slow growth tends to produce very clean hexagonal prisms, which are well suited for producing beautiful atmospheric displays. The example here is a South Pole halo, showing a rich variety of arcs and halos.
Halos arise from the way minute ice crystals in the atmosphere scatter Sunlight (or Moonlight!) into different angles.
The quality of a halo depends on the type and quality of the ice crystals that produce it.
(13 voti)
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Moon-1.jpgThe Moon over a "Red Planet"83 visiteOriginal caption:"Near its Northernmost declination, tonight's Full Moon (Dec. 15, 2005) will be a special one, arcing high in Northern Hemisphere skies. But a Full Moon won't occur on this calendar date for another 19 years, a period known as the Lunar Metonic Cycle (...)".
(13 voti)
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YoungMoon.jpgYoung Moon127 visite'Luna Giovane'. L'ultima 'Luna Giovane' risale al 9 Maggio scorso (AD 2005) e questa fotografia la riprende mentre essa è giunta alla sua 34°ma ora (e 18') di 'vita'.
In effetti, quando si calcola l'età della Luna durante una completa lunazione (ossìa un intero "ciclo di tutte le sue fasi") - dalla Luna Nuova alla Luna Piena e quindi ancora alla Luna Nuova - la Luna non 'invecchia' mai più di 29 giorni e 12 ore.
A parte questa piccola curiosità, ci piace sottolineare che la Luna Giovane, quando appare come una sottilissima falce nel nostro cielo, non è solo un grande spettacolo offerto dalla Natura (ed un grande piacere 'visivo'!), ma è anche un momento assai propizio - come accade durante le eclissi - per cercare di vedere dei TLP o anche di cogliere dei bagliori da impatti sul suo lato in ombra.
Certo, ci vuole una grande dose di fortuna per cogliere questi rarissimi fenomeni mentre accadono ma...Se non si prova neppure quando il momento è favorevole, allora non si riuscirà mai a vederli!
O no?!?
(13 voti)
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MoonMercMonaco_jacques_full.jpgThe Moon and Mercury, from Monaco (FRA)133 visiteUna falce di Luna ed una piccola scintilla, piuttosto alta nel cielo della sera: Mercurio.
Una bella immagine che ci arriva dalla Francia e che ha trovato spazio anche nella Rubrica "NASA - Picture of the Day".
Questa la caption originale:"Low on the western horizon after sunset, a slender crescent Moon and wandering planet Mercury join the lights of Menton and Monaco along the French Riviera. Astronomer Vincent Jacques took advantage of this gorgeous photo opportunity a week ago on March 11, when the Moon and Mercury were separated in the sky by just 3°. Of course, the Moon in a slender crescent phase is always seen near the horizon, as is Mercury - a bright planet which can be difficult to glimpse as it never strays far from the Sun in Earth's sky. In the coming days good views of Mercury will indeed be fleeting as the Solar System's innermost planet is rapidly dropping closer to the glare of the setting Sun".
(13 voti)
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Solar_Eclipse_1999-MIR.jpgMacular Degeneration on a Planetary Scale143 visiteCaption NASA, from "NASA - Picture of the Day" del giorno 2 Gennaio 2011:"Here is what the Earth looks like during a Solar Eclipse.
The shadow of the Moon can be seen darkening part of Earth. This shadow moved across the Earth at nearly 2000 Km-per-hour.
Only observers near the center of the dark circle can see a Total Solar Eclipse - others see a Partial Eclipse where only part of the Sun appears blocked by the Moon.
This spectacular picture of the 1999 August 11 Solar Eclipse was one of the last ever taken from the Mir Space Station. The two bright spots that appear on the upper left are thought to be Jupiter and Saturn. Mir was deorbited in a controlled re-entry in 2001".MareKromium
(12 voti)
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