| Risultati della ricerca nelle immagini - "SST" |
1 - Milky Way - SST-1.jpgThe Milky Way (infrared vision - SST) - 1104 visite"...La Scienza ha sue Regole, ci dicono, e vanno rispettate se si vuol essere scienziati: d’accordo. Ma sono le Regole della Scienza o piuttosto le regole di chi decide come fare Scienza?
È la realtà a stabilire le modalità per la sua conoscenza o non sono piuttosto dogmi imposti da chi si è fatto il nido su una cattedra universitaria?..."
Paolo Cortesi
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1 - Milky Way - SST-2.jpgThe Milky Way (infrared vision - SST) - 286 visite"...non esiste, a mio parere, una 'Scienza in sè': esiste la Scienza Universale - che non conosciamo e che, forse, non compete a noi conoscere - ed esiste la Scienza Umana - e cioè quella fatta dagli uomini, a loro immagine e somiglianza, ed in virtù di tale somiglianza essa è piena di concetti ed intuizioni giuste, ma è pure traboccante di errori ed imprecisioni.
Dire che la Scienza Universale e la Scienza Umana sono la stessa cosa o che condividono la medesima Natura, equivale a dire che Dio e l'Uomo sono la stessa cosa e condividono la medesima Natura.
Ora, dato che su quest'ultimo assunto io ho qualche serio dubbio, mi accontento di pensare che la nostra Scienza sia solo "figliastra" della Scienza Universale e, se così realmente fosse, me ne rallegrerei, poichè un rapporto imperfetto è comunque meglio della mancanza di rapporto..."
P.C. Floegers - "In the Paradox"
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2-Milky Way - SST.jpgThe center of the Milky Way: what's behind the dust!106 visite"...Delere licebit quod non edideris; (sed) nescit vox missa reverti..."
(Orazio)
"...Si può cancellare tutto ciò che rimane inespresso; ma una volta che si è parlato, nulla di quanto detto potrà mai essere restituito al silenzio..."
("...Voce dal sen fuggita - Più richiamar non vale; - Non si rattien lo strale - Quando dall'arco uscì..." - Metastasio)
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BlackWidowNebula-SST-PIA03544.jpgThe "Black Widow" Nebula74 visite"...Lo spettacolo che gli si offriva da lassù era incredibilmente bello: una vasta pianura, dall'aspetto ancora evanescente a causa della bruma che il calore del sole stava dissolvendo, apriva la scena.
A seguire, un dolcissimo corpo collinoso che, degradando lentamente, portava a posare lo sguardo su un enorme tavolato azzurro e luccicante più del Cielo.
Il desiderio di spiccare un salto che lo portasse a poggiare i piedi su quelle terre per un istante tentò la sua mente al punto da rivolgere, quasi d'istinto, nuovamente lo sguardo verso quegli uccelli che, veleggiando sopra ed intorno a lui, sembravano invitarlo ad unirsi a loro. Si spogliò e si avvicinò al ciglio dello strapiombo che si apriva sotto di lui e con lenti movimenti delle braccia cominciò ad imitarne il loro volo in una mistica trasfigurazione di gesti e di sensi..."
Giuseppe Spina - "La Scalata"
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Cartwheel_5panel.jpgThe "Cartwheel Galaxy"60 visite"...La frase più ricorrente è “I virus non sono né forme di vita né materia inanimata”. Non è proprio ortodosso definire un’entità dicendo ciò che non è… Cosa se ne ricava? Non sono organismi biologici, non si riproducono e non si evolvono autonomamente, ma sono composti di materia, che però è dotata di mobilità. In parole povere, i virus sono delle macchine..."
Alessio Feltri
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Cassiopeia_A-PIA11748.jpgSNR Cassiopeia "A"53 visiteFor the first time, a multiwavelength three-dimensional reconstruction of a SuperNova Remnant has been created. This stunning visualization of Cassiopeia A, or Cas A, the result of an explosion approximately 330 years ago, uses data from several telescopes: X-ray data from NASA's Chandra X-ray Observatory, InfraRed data from NASA's Spitzer Space Telescope and optical data from the National Optical Astronomy Observatory 4-meter telescope at Kitt Peak, Ariz., and the Michigan-Dartmouth-MIT 2.4-meter telescope, also at Kitt Peak. In this visualization, the green region is mostly Iron observed in X-rays. The yellow region is a combination of Argon and Silicon seen in X-rays, optical, and infrared — including jets of Silicon — plus outer debris seen in the optical. The red region is cold debris seen in the infrared. Finally, the blue reveals the outer blast wave, most prominently detected in X-rays.
Most of the material shown in this visualization is debris from the explosion that has been heated by a shock moving inwards. The red material interior to the yellow/orange ring has not yet encountered the inward moving shock and so has not yet been heated. These unshocked debris were known to exist because they absorb background radio light, but they were only recently discovered in infrared emission with Spitzer. The blue region is composed of gas surrounding the explosion that was heated when it was struck by the outgoing blast wave, as clearly seen in Chandra images.
To create this visualization, scientists took advantage of both a previously known phenomenon — the Doppler effect — and a new technology that bridges astronomy and medicine. When elements created inside a supernova, such as Iron, Silicon and Argon, are heated they emit light at certain wavelengths. Material moving towards the observer will have shorter wavelengths and material moving away will have longer wavelengths. Since the amount of the wavelength shift is related to the speed of motion, one can determine how fast the debris are moving in either direction.
Because Cas A is the result of an explosion, the stellar debris is expanding radially outwards from the explosion center. Using simple geometry, the scientists were able to construct a 3-D model using all of this information. A program called 3-D Slicer — modified for astronomical use by the Astronomical Medicine Project at Harvard University in Cambridge, Mass. — was used to display and manipulate the 3-D model. Commercial software was then used to create the 3-D fly-through.
The blue filaments defining the blast wave were not mapped using the Doppler Effect because they emit a different kind of light —synchrotron radiation — that does not emit light at discrete wavelengths, but rather in a broad continuum. The blue filaments are only a representation of the actual filaments observed at the blast wave.
This visualization shows that there are two main components to this supernova remnant: a spherical component in the outer parts of the remnant and a flattened (disk-like) component in the inner region. The spherical component consists of the outer layer of the star that exploded, probably made of helium and carbon. These layers drove a spherical blast wave into the diffuse gas surrounding the star.
The flattened component — that astronomers were unable to map into 3-D prior to these Spitzer observations — consists of the inner layers of the star. It is made from various heavier elements, not all shown in the visualization, such as Oxygen, Neon, Silicon, Sulphur, Argon and Iron.
High-velocity plumes, or jets, of this material are shooting out from the explosion in the plane of the disk-like component mentioned above. Plumes of Silicon appear in the North/East and South/West, while those of Iron are seen in the South/East and North. These jets were already known and Doppler velocity measurements have been made for these structures, but their orientation and position with respect to the rest of the debris field had never been mapped before now.
This new insight into the structure of Cas A gained from this 3-D visualization is important for astronomers who build models of supernova explosions. Now, they must consider that the outer layers of the star come off spherically, but the inner layers come out more disk-like with high-velocity jets in multiple directions.MareKromium
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Centaurus A-SST-1.jpgCentaurus A - SST (HR)56 visite"...Nusquam tuta Fides..."
(Virgilio)
"...La Fede non è al sicuro in nessun luogo..."
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Centaurus_Region~0.jpgCentaurus Region54 visite"...Aquila muscas non captat..."
(Binder)
"...L'Aquila non cattura le mosche..."MareKromium
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Comets-Schwassmann_Wachmann_1-04.jpgComet Schwassmann-Wachmann 3 from SST53 visiteThis image from NASA's Spitzer Space Telescope (SST) shows three of the many fragments making up Comet 73P/Schwassman-Wachmann 3. The infrared picture also provides the best look yet at the crumbling comet's trail of debris, seen here as a bridge connecting the larger fragments.
The comet circles around our Sun every 5,4 years.
In 1995, it splintered apart into four pieces, labeled "A" through "D", with "C" being the biggest. Since then, the comet has continued to fracture into dozens of additional pieces. This image is centered about midway between fragments "C" and "B"; fragment "G" can be seen in the upper right corner.
The comet's trail is made of dust, pebbles and rocks left in the comet's wake during its numerous journeys around the sun. Such debris can become the stuff of spectacular meteor showers on Earth.
This image was taken on April 1, 2006, by Spitzer's Multi-Band Imaging Photometer using the 24-micron wavelength channel.
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Comets-Schwassmann_Wachmann_1-07.jpgComet Schwassmann-Wachmann 3: the whole "crumbling" Comet (1)53 visiteThis false-color mosaic of crumbling Comet Schwassmann-Wachmann 3 spans about 6° (about 12 full moons) along the Comet's orbit. Recorded on May 4-6, 2006, by an infrared camera on board the Spitzer Space Telescope, the picture captures about 45 of the 60 or more alphabetically cataloged large Comet Fragments. The brightest fragment at the upper right of the track is Fragment "C" (frame 1). Bright Fragment "B" is below and left of center (frame 2). Looking for clues to how the Comet broke up, Spitzer's infrared view also captures the trail of dust left over as the Comet deteriorated during previous passes. Emission from the dust particles warmed by sunlight appears to fill the space along the cometary orbit. The fragments are near their closest approach in the coming days, about 10 MKM away, and none pose any danger to our fair Planet.
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Comets-Schwassmann_Wachmann_1-08.jpgComet Schwassmann-Wachmann 3: the whole "crumbling" Comet (2)54 visitenessun commento
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Comets-Schwassmann_Wachmann_1-09.jpgComet Schwassmann-Wachmann 3: the whole "crumbling" Comet (3)54 visitenessun commento
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