| Ultimi arrivi - Deep Sky Objects |
Dying Star-PIA04277.jpgA "dying star" from HST81 visite"...Life is a great surprise. I do not see why Death should not be an even greater one..."
Vladimir NabokovMar 07, 2005
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HD-44179-The_Red_Rectangle-PIA04533.jpgHD44179: The "Red Rectangle" - HST119 visite"I've never read a political poem that's accomplished anything. Poetry makes things happen, but rarely - if ever - what the poet wants"
Howard NemerovMar 07, 2005
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Graph-PIA07336.jpgA Brown-Dwarf's planetary system and the Solar System131 visiteThis artist's conception shows the relative size of a hypothetical brown dwarf-planetary system (below) compared to our own solar system. A brown dwarf is a cool or "failed" star, which lacks the mass to ignite and shine like our Sun. NASA's SST set its infrared eyes on an extraordinarily low-mass brown dwarf called OTS 44 and found a swirling disc of planet-building dust. At only 15 times the mass of Jupiter, OTS 44 is the smallest known brown dwarf to host a planet-forming, or protoplanetary, disc.
Astronomers believe that this unusual system will eventually spawn planets. If so, they speculate that OTS 44's disc has enough mass to make one small gas giant and a few Earth-sized rocky planets. Examples of these possible planets are depicted at the bottom of this picture, circling a low-mass brown dwarf. Above, the bodies of our own Solar System have been drawn to the same scale. In each system, the terrestrial planets have been enlarged and the distances between them and their parent bodies scaled down.Mar 07, 2005
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Graph-PIA07337.jpgOTS 44: another "failed" star116 visiteThis graph of data from NASA's SST shows that an extraordinarily low-mass brown dwarf, or "failed star," is circled by a disc of planet-building dust. The brown dwarf, called OTS 44, is only 15 times the mass of Jupiter, making it the smallest known brown dwarf to host a planet-forming disc.
SST was able to see this unusual disc by measuring its infrared brightness. Whereas a brown dwarf without a disc (red dashed line) radiates infrared light at shorter wavelengths, a brown dwarf with a disc (orange line) gives off excess infrared light at longer wavelengths. This surplus light comes from the disc itself and is represented here as a yellow dotted line. Actual data points from observations of OTS 44 are indicated with orange dots. These data were all acquired by using SST's infrared array camera.Mar 07, 2005
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Graph-PIA07395.jpgLooking back...118 visiteThis graph, or spectrum, shows the light from a dusty, distant galaxy (invisible to optical telescopes) that is located 11 BLY away. NASA's SST was able to capture the light from it by using heat-seeking infrared eyes. Spectra are created when a spectrograph spreads light out into its basic parts, like a prism turning sunlight into a rainbow. The spectra contain the signatures of molecules that contribute to an object's light. In this case, the galaxy's spectrum reveals the fingerprint for silicate dust (large dip at right), a planetary building block like sand, only smaller. This particular fingerprint is important because it helps to determine how far away the galaxy lies as well as how much the galaxy's light had stretched ("redshifted") during its journey to SST's eyes. Because the universe is expanding, a galaxy's light will shift toward reddish wavelengths as it moves away from us. This galaxy has a redshift of 1,95, meaning that its light travelled for 11 BY before 'hitting" SST's eyes. The presence of the silicate fingerprint is also significant because it implies that galaxies were ripe for planetary formation 11 billion years ago - back to a time when the universe was 3 billion years old. The universe is currently believed to be 13.5 billion years old. This is the furthest back in time that silicate dust has been detected around a galaxy.Mar 07, 2005
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NGC-1427A_-_HST.jpgNGC 1427A - HST74 visite"Honores iniuriaeque vulgi in promiscuo habendae: nec his dolendum, nec illis gaudendum"
(Tacito)
"I plausi e le offese che arrivano dalle masse devono valutarsi in maniera simile: (poichè) delle seconde, non ci si deve offendere; (e) dei primi, non bisogna gioire"Mar 04, 2005
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NGC-2170-2.jpgNGC 2170 - Diffuse Nebula or Supernova Remnant (RN type) in Monoceros 90 visite"Il binomio Vita=Consapevolezza, tanto caro non solo alla Vostra Scienza, ma anche a molte Religioni Umane, è errato e fuorviante. Lo è poichè esistono infinite forme di Vita, nell'Universo, che prescindono dalla consapevolezza, almeno nel senso in cui la intendete Voi, e cioè "Coscienza di sè" e del proprio "essere". Coscienza di esistere. La Vita non ha bisogno di queste costruzioni pseudo-scientifiche e vagamente mistiche. La Vita, sulla Terra e nel resto dell'Universo, è solo un fatto: essa esiste. Se foste capaci di vedere oltre le costruzioni erette dal senso comune e dalla razionalità (gli orrendi limiti che avete imposto alla vostra capacità di comprendere), allora - forse - non rifiutereste a priori l'idea che l'intero Creato è "vivo"!
Già. Ma se foste capaci di superare quei limiti, come fareste a deantropocentrizzare il "vostro" Universo? Come spiegare agli uomini che non siete gli Eletti, nè i Padroni del Cielo e della Terra; nè le prove viventi di un Pensiero Divino fatto solo per voi?..."
P.C. Floegers - "Conversations"Mar 03, 2005
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NGC-1531_and_NGC-1532.jpgNGC 1531 and 1532 - Interacting Galaxies70 visite"Le maggiori difficoltà che incontriamo, a livello scientifico, allorchè tentiamo di comprendere alcuni fenomeni, non derivano soltanto dalla complessità dei temi affrontati, ma anche da un errore di prospettiva. La comprensione dei fenomeni dell'Universo, infatti, presuppone anche la consapevolezza che non tutto può essere spiegato usando solo le nostre facoltà logiche ed intuitive: l'umana capacità di comprendere è grande ma non è infinita, mentre la Natura che investighiamo lo è. Ad esempio: la Scienza Convenzionale rifiuta l'idea stessa di un possibile contatto fra la nostra Civiltà ed una Civiltà Aliena e questa risposta viene data speculando su concetti propri della nostra Cultura - Scientifica ed Umanistica - quali il Tempo e la Distanza. Questi due concetti esprimono dei limiti: limiti propri della nostra Specie, in questa fase evolutiva.
Ma cosa spinge i Maestri della nostra Scienza Convenzionale a ritenere che questi limiti sìano validi in tutto l'Universo?"
P. C. Floegers - "Conversations"Mar 01, 2005
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M2-9 Planetary Nebula.jpgThe "M2-9 Planetary Nebula" (HST)124 visite"...Omnis feret omnia tellus..."
(Virgilio)
"...Ogni terra produrrà ogni specie di frutti..." Feb 27, 2005
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Magnetar.jpgMagnetars and Gamma Ray Burst sequence106 visiteDa "NASA - Picture of the Day" del 21-02-2005:"Last December, a dense sheet of Gamma Rays only a bit wider than the Earth plowed through our Solar System, saturating satellites and noticeably reflecting off the Moon. A magnetar near our Galactic Center, the source of Soft Gamma Repeater (SGR) 1806-20, had unleashed its largest flare on record. The brightness and briefness of the explosion's initial peak made it look quite similar to another type of tremendous explosion if viewed from further away - a short duration gamma-ray burst (GRB). Short duration GRBs are thought to be fundamentally different than their long duration GRB that are likely related to distant supernovae. In the picture there's a series of drawings depicting an outgoing explosion during the initial SGR spike. A fast moving wave of radiation is shooting away from a central magnetar. The possible link between SGRs and GRBs may become clearer as more and similar events are detected by the Earth-orbiting Swift Satellite".Feb 21, 2005
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BIG DIPPER.jpgBig Dipper213 visite"...Secundis nemo confidat; adversis nemo deficiat: alternae sunt vices rerum..."
(Seneca)
"...Nessuno confidi (troppo) nella buona sorte (e) nessuno si abbatta (eccessivamente) nelle avversità: (poichè) alterne sono le vicende della vita..."Feb 18, 2005
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NGC-2237_and_NGC-2244-1.jpgNGC 2237 - The "Rosette Nebula", and Globular Star Cluster NGC 224491 visite"...Dio esiste perchè noi esistiamo: vive nella nostra Coscienza, nella Coscienza dell'Umanità, nell'Universo che ci circonda. La nostra Coscienza lo invoca nei momenti più solenni di dolore e di gioia. L'Umanità ha potuto trasformarne e guastarne il Nome, ma mai sopprimerlo..."
(Giuseppe Mazzini)Feb 14, 2005
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