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| Risultati della ricerca nelle immagini - "Comets" |
36-Shackleton_Crater-AMI_EAE3_001775_00002_00020.jpgSchakleton Crater in natural colors56 visiteThe Advanced Moon Imaging Experiment Camera (AMIE) obtained this image on 13 January 2006 - close to the time of Lunar Southern Summer - from a distance of about 646 Km over the surface and with a ground resolution of 60 mt per pixel.
Shackleton crater lies at the Lunar South Pole (89,54 S. Lat. and 0 East Lng.) and has a diameter of approx. 19 Km.
SMART-1 monitored this area almost every orbit. This will allow to produce very high resolution maps of the area as well as illumination maps. The long shadows that surround the crater make it very hard to observe. The analysis of the data obtained allowed a very detailed map of its rim, surrounding ejectas and craters.
SMART-1 also made long repeated exposures to see inside the shadowed areas. The purpose was detecting the very weak reflected light from the crater rims, and therefore study the surface reflection properties (albedo) and its spectral variations (mineralogical composition). These properties could reveal patchy ice surface layers inside the crater.
On the 2-kilometre wide inner edge of the crater ridge, at times barely visible from Earth, astronomers using ground radio-telescopes have recently reported they were not able to detect a distinctive signature of thick deposits of ice in the area. Earlier measurements by NASA's Lunar Prospector reported of hydrogen enhancement over large shadowed areas.
"We still do not know if this hydrogen is due to enhanced trapping of solar wind, or to the water ice brought on the Moon by the bombardment of comets and asteroids," says Bernard Foing, ESA's SMART-1 Project Scientist. "These bodies may have deposited on the Moon patchy layers of ice filling about 1.5 percent of the areas in permanent shadow, down to one metre below the surface."
"We need to analyse all remote sensing data sets consistently. Future lander and rover missions to the Moon will help in the search and characterisation of lunar polar ice, both on the surface and below the subsurface," Foing continues. "In any case, one day we may even be able to simply combine the implanted hydrogen and the oxygen extracted from lunar rocks to produce clean water, like we do in laboratory experiments on Earth.
The crater is named after Ernest Shackleton (1874-1922), an explorer famous for his Antartic expeditions.
MareKromium
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AlienWorld-PIA09228.jpgTwin Suns' Sunset53 visiteOur solitary sunsets here on Earth might not be all that common in the grand scheme of things. New observations from NASA's Spitzer Space Telescope have revealed that mature planetary systems -- dusty disks of asteroids, comets and possibly planets -- are more frequent around close-knit twin, or binary, stars than single stars like our sun. That means sunsets like the one portrayed in this artist's photo concept, and more famously in the movie "Star Wars," might be quite commonplace in the universe.
Binary and multiple-star systems are about twice as abundant as single-star systems in our galaxy, and, in theory, other galaxies. In a typical binary system, two stars of roughly similar masses twirl around each other like pair-figure skaters. In some systems, the two stars are very far apart and barely interact with each other. In other cases, the stellar twins are intricately linked, whipping around each other quickly due to the force of gravity.
Astronomers have discovered dozens of planets that orbit around a single member of a very wide stellar duo. Sunsets from these worlds would look like our own, and the second sun would just look like a bright star in the night sky.
But do planets exist in the tighter systems, where two suns would dip below a planet's horizon one by one? Unveiling planets in these systems is tricky, so astronomers used Spitzer to look for disks of swirling planetary debris instead. These disks are made of asteroids, comets and possibly planets. The rocky material in them bangs together and kicks up dust that Spitzer's infrared eyes can see. Our own solar system is swaddled in a similar type of disk.
Surprisingly, Spitzer found more debris disks around the tightest binaries it studied (about 20 stars) than in a comparable sample of single stars. About 60 percent of the tight binaries had disks, while the single stars only had about 20 percent. These snug binary systems are as close or closer than just three times the distance between Earth and the sun. And the disks in these systems were found to circumnavigate both members of the star pair, rather than just one.
Though follow-up studies are needed, the results could mean that planet formation is more common around extra-tight binary stars than single stars. Since these types of systems would experience double sunsets, the artistic view portrayed here might not be fiction.
The original sunset photo used in this artist's concept was taken by Robert Hurt of the Spitzer Science Center at the California Institute of Technology, Pasadena, Calif.
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Asteroids.jpgAsteroids (an Image-Mosaic by Emily Lakdawalla - Planetary Society - & Ted Stryk)99 visiteDalla Rubrica "NASA - Picture of the Day" del giorno 26 Luglio 2010:"As humans explore the Universe, the record for largest Asteroid visited by a Spacecraft has increased yet again. Earlier this month, ESA's robotic Rosetta Spacecraft zipped past the asteroid 21 Lutetia taking data and snapping images in an effort to better determine the history of the Asteroid and the origin of its unusual colors.
Although of unknown composition, Lutetia is not massive enough for gravity to pull it into a sphere.
Pictured above on the upper right, the 100-Km across Lutetia is shown in comparison with the other nine Asteroids and four Comets that have been visited, so far, by human-launched spacecraft. Orbiting in the Main Asteroid Belt, Lutetia shows itself to be a heavily cratered remnant of the early Solar System.
The Rosetta Spacecraft is now continuing onto comet Churyumov-Gerasimenko where a landing is planned for the AD 2014".MareKromium
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CG-4.jpgCometary Globule (CG) - 467 visite"...Esistono molte forme di Consapevolezza. Ci sono dei momenti, in cui si pi sensibili, in cui il proprio intuito pi vasto e profondo. Uno dei poteri dellArte rendere pi grande e profonda, in modi diversi, la Consapevolezza di una persona, che si tratti di Consapevolezza Estetica, Morale o Mistica. Questa una funzione anche della Scienza e della Filosofia: favorire forme di Consapevolezza intellettuale pi ampie e profonde. Una persona ha degli stati danimo, o degli umori, nei quali la Consapevolezza sembra espandersi e farsi pi comprensiva, accogliente, generosa, sensibile e anche particolareggiata, mentre in altre occasioni sembra restringersi. Leducazione andrebbe considerata come educazione alla Consapevolezza, e non solo come linsegnamento delle varie professioni.
Ogni contatto umano ha il potenziale di cambiare la Consapevolezza, perch ci simbatte in una concezione ed una costruzione del mondo diverse dalla propria..."
Oliver Sacks
Caption originale:"The odd looking "creature" in the center of the above photo is a gas cloud known as a cometary globule. This globule, however, has ruptured. Cometary globules are typically characterized by dusty heads and elongated tails. These features cause cometary globules to have visual similarities to comets, but in reality they are very much different. Globules are frequently the birthplaces of stars, and many show very young stars in their heads. The reason for the rupture in the head of this object is not completely known. The galaxy to the left of center is huge, very far in the distance, and only placed near CG4 by chance superposition".
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CometHale-Bopp-970401C_lodriguss.jpgOn the edge of Oblivion...53 visite"...Mi dispiace vedere che gran parte delle persone vivano la loro Vita non secondo un modello personale - magari discutibile, ma proprio -, bens secondo il modello creato solo ed esclusivamente dalla televisione (o da chi per essa).
Un modello orrendo e della razza peggiore.
Certo, non esiste un modello predefinito di "Vita" e allora ognuno di noi cresce assieme a quello che gli sta attorno, aiutandosi con quanto si trova in giro. Per...
Per vedo sempre pi maiali inconsapevoli di viaggiare verso il mattatoio e, anche se dovrei (forse) preoccuparmi pi di me stesso, questa visione - un p - mi duole..."
Giorgio Picciau - "Lettere"MareKromium
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Comet_Borisov_-_GIF.gifFrom far away: Comet Borisov (GIF-Movie)114 visitenessun commentoMareKromium
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Comet_Borisov_-_GIF_3.gifFrom far away: the Comet Borisov through the Solar System (GIF-Movie)279 visiteGuardate bene! EccoVi la differenza (REALE ed IN FATTO) tra un Fly-By and uno Swing-By...E senza dimenticare "Oumuamua"!
As the first known object of its type, Oumuamua presented a unique case for the International Astronomical Union (IAU, for short), which assigns designations for astronomical objects. Originally classified as comet C/2017 U1, it was later reclassified as Asteroid A/2017 U1, due to the absence of a coma (--> "Chioma", in Italian).
Once it was unambiguously identified as coming from outside the Solar System, a new designation was created.
The name comes from the Hawaiian word "oumuamua", meaning 'scout' (from ou, meaning 'reach out for', and mua, reduplicated for emphasis, meaning 'first, in advance of', and reflects the way this object is like a scout or messenger sent from the distant past to reach out to Humanity.
It roughly translates to 'first distant messenger' (or "The First Messenger from the distance").
Before the official name was decided upon, the name "Rama" was suggested by the name given to an Alien Spacecraft discovered under similar circumstances in the 1973 science fiction novel "Rendezvous with Rama", by Sir Arthur C. Clarke.MareKromium
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Comet_Borisov_-_Still.pngFrom far away: Comet Borisov134 visiteDa un altro Sistema, dallo Spazio Interstellare, da "altrove".... La "Cometa" Borisov attraverser il nostro Sistema Solare cos come una Rondine attraversa il nostro campo visivo in un luminoso giorno di Primavera.
Da dove viene? Dove va?
... Ma che importa, alla fine?!?.....MareKromium
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Comets-Borrelly_Comet-PIA03500_modest.jpgThe "Borrelly" Comet from Deep Space 153 visiteIn this highest resolution view of the icy, rocky nucleus of comet Borrelly, (about 45 meters or 150 feet per pixel) a variety of terrains and surface textures, mountains and fault structures, and darkened material are visible over the nucleus's surface. This was the final image of the nucleus of comet Borrelly, taken just 160 seconds before Deep Space1's closest approach to it. This image shows the 8-km (5-mile) long nucleus about 3417 kilometers (over 2,000 miles) away.
Smooth, rolling plains containing brighter regions are present in the middle of the nucleus and seem to be the source of dust jets seen in the coma. The rugged land found at both ends of the nucleus has many high ridges along the jagged line between day and night on the comet. This rough terrain contains very dark patches that appear to be elevated compared to surrounding areas. In some places the dark material accentuates grooves and apparent faults.
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Comets-Comet_Churyumov-Gerasimenko-cometCG01_rosetta_2048-MF-EB-LXTT-IPF.jpgA view of Comet Churyumov-Gerasimenko217 visiteUn "piccolo" Tributo dato dalla prestigiosa rubrica quotidiana NASA "Astronomy Picture Of The Day" ai nostri Amici e Partner, Marco Faccin ed Elisabetta Bonora. Guardate su http :// apod. nasa. gov/ apod/ astropix.html di luned, 15 Settenbre 2014. Complimenti, di Cuore! E, sia detto per Onest Intellettuale, qui, Lunexit, non c'entra nulla. Il nostro solo un Omaggio a due OTTIMI Partners. Ma Lunexit, su questo Lavoro, non ha credito alcuno.MareKromium
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Comets-Comet_Hartley_2-EB-LXTT1.jpgComet "Hartley 2" (credits for the additional process. and color.: Elisabetta Bonora - Lunexit Team)73 visitenessun commentoMareKromium
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Comets-Comet_Hartley_2-EB-LXTT2.jpgComet "Hartley 2" (credits for the additional process. and color.: Elisabetta Bonora - Lunexit Team)69 visitenessun commentoMareKromium
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