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| Risultati della ricerca nelle immagini - "ST" |
018-Vesta-6-PIA13428.jpgSome of the "Faces" of 4-Vesta, from Hubble Space Telescope96 visiteNASA's Hubble Space Telescope snapped these images of the Asteroid 4-Vesta in preparation for the Dawn Spacecraft's visit in 2011. Each of the 4 Hubble images captures views of Vesta during its 5,34-hour rotation period. Hubble's sharp "eye" can see features as small as about 40 Km (24,84 miles) across in these images. Vesta was 211 MKM (approx. 131 MMs) from Earth when Hubble made the observations.
The images show the difference in brightness and color on the Asteroid's Surface. These characteristics hint at the large-scale features that the Dawn Spacecraft will see when it visits the potato-shaped asteroid.
Astronomers used the images, taken with Hubble's Wide Field Camera 3, to better determine 4-Vesta's Spin Axis. Based on the HST observations, astronomers calculated a slightly different, and more precise, Rotation Axis for Vesta. The new calculation will change the pattern of sunlight expected to illuminate the Asteroid when Dawn arrives.
Determining a more accurate Spin Axis for 4-Vesta will also help scientists refine the Dawn Spacecraft's orbit around the Asteroid. Dawn will orbit the rocky object for a year, beginning in July 2011. The Spacecraft will then travel to the "Dwarf Planet" 1-Ceres, arriving in 2015.
Hubble has kept its "eye" on 4-Vesta for more than 15 years, beginning in 1994. Hubble images of 4-Vesta in 1997 helped astronomers discover the Asteroid's very large Impact crater. Astronomers combined views of 4-Vesta in Near-UltraViolet and blue light to construct these images and the images were taken on Feb. 25, 2010.MareKromium
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019-Vesta-5-PIA13427.jpg4-Vesta from Hubble Space Telescope103 visiteThe Asteroid 4-Vesta is somewhat like our Moon, with ancient Lava Beds (the dark patches) and powdery Debris (or Regolith), such as the pulverized remains of impacts (the orange-colored areas). A flattened area on one end of 4-Vesta is a giant Impact Crater formed by a collision that perhaps occurred billions of years ago.
The crater is approx. 460 Km (285,66 miles) across, which makes it close to 4-Vesta's roughly 530-Km (329,13-mile) diameter. The asteroid is about the size of Arizona.
4-Vesta is one of the largest of a reservoir of about 100.000 Asteroids, the leftover material from the formation of our Solar System.
Astronomers combined images of Vesta in Near-UltraViolet and blue light to make this picture movie. The Hubble observations were made on Feb. 25 and Feb. 28, 2010.MareKromium
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1 - Milky Way - SST-1.jpgThe Milky Way (infrared vision - SST) - 1113 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) - 298 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!114 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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30-Doradus.jpg30 Doradus and R-13657 visiteThe massive, young stellar grouping, called R136, is only a few million years old and resides in the 30 Doradus Nebula, a turbulent star-birth region in the Large Magellanic Cloud (LMC), a satellite galaxy of our Milky Way. Many of the stars are among the most massive known. Several of them are over 100 times more massive than our Sun. These hefty stars are destined to become supernovae in a few million years.
The image, taken by Hubble's Wide Field Camera 3, spans about 100 light-years. The nebula is close enough to Earth that Hubble can resolve individual stars, giving astronomers important information about the stars' birth and evolution.
The brilliant stars are carving deep cavities in the surrounding material by unleashing a torrent of ultraviolet light, and hurricane-force stellar winds (streams of charged particles), which are etching away the enveloping hydrogen gas cloud in which the stars were born. The image reveals a fantasy landscape of pillars, ridges, and valleys, as well as a dark region in the center that roughly looks like the outline of a holiday tree. Besides sculpting the gaseous terrain, the brilliant stars can also help create a successive generation of offspring. When the winds hit dense walls of gas, they create shocks, which may be generating a new wave of star birth.
The movement of the LMC around the Milky Way may have triggered the massive cluster's formation in several ways. The gravitational tug of the Milky Way and the companion Small Magellanic Cloud may have compressed gas in the LMC. Also, the pressure resulting from the LMC plowing through the Milky Way's halo may have compressed gas in the satellite. The cluster is a rare, nearby example of the many super star clusters that formed in the distant, early universe, when star birth and galaxy interactions were more frequent. Previous Hubble observations have shown astronomers that super star clusters in faraway galaxies are ubiquitous. The LMC is located 170,000 light-years away and is a member of the Local Group of Galaxies, which also includes the Milky Way.
The Hubble image was taken at infrared wavelengths (1.1 microns and 1.6 microns). Hubble sees through the dusty nebula, revealing many stars that cannot be seen in visible light. The large bright star just above the center of the image is in the 30 Doradus nebula. The Hubble observations of 30 Doradus were made October 20-27, 2009.MareKromium
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30-Doradus_and_R-136.jpg30 Doradus and R-13662 visiteJust in time for the holidays: a Hubble Space Telescope picture postcard of hundreds of brilliant blue stars wreathed by warm, glowing clouds. The festive portrait is the most detailed view of the largest stellar nursery in our local galactic neighborhood. The massive, young stellar grouping, called R136, is only a few million years old and resides in the 30 Doradus Nebula, a turbulent star-birth region in the Large Magellanic Cloud (LMC), a satellite galaxy of our Milky Way. There is no known star-forming region in our galaxy as large or as prolific as 30 Doradus. Many of the diamond-like icy blue stars are among the most massive stars known. Several of them are over 100 times more massive than our Sun. These hefty stars are destined to pop off, like a string of firecrackers, as supernovas in a few million years.
The image, taken in ultraviolet, visible, and red light by Hubble's Wide Field Camera 3, spans about 100 light-years. The nebula is close enough to Earth that Hubble can resolve individual stars, giving astronomers important information about the birth and evolution of stars in the universe. The Hubble observations were taken Oct. 20-27, 2009. The blue color is light from the hottest, most massive stars; the green from the glow of oxygen; and the red from fluorescing hydrogen.MareKromium
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APOLLO_14_-_AS_14-66-9253-9256.jpgAS 14-66-9253 to 9256 - Tribute to the Braves (Image-Mosaic and True Colors; credits: Dr Marco Faccin - Lunexit Team)109 visitenessun commentoMareKromium
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ARP-147.jpgARP 14759 visiteJust a couple of days after the orbiting observatory was brought back online, Hubble aimed its prime working camera, the Wide Field Planetary Camera 2 (WFPC2), at a particularly intriguing target, a pair of Gravitationally Interacting Galaxies called Arp 147.
The image demonstrated that the camera is working exactly as it was before going offline, thereby scoring a "perfect 10" both for performance and beauty.
The two galaxies happen to be oriented so that they appear to mark the number 10. The left-most galaxy, or the "one" in this image, is relatively undisturbed apart from a smooth ring of starlight. It appears nearly on edge to our line of sight. The right-most galaxy, resembling a zero, exhibits a clumpy, blue ring of intense star formation.
The blue ring was most probably formed after the galaxy on the left passed through the galaxy on the right. Just as a pebble thrown into a pond creates an outwardly moving circular wave, a propagating density wave was generated at the point of impact and spread outward. As this density wave collided with material in the target galaxy that was moving inward due to the gravitational pull of the two galaxies, shocks and dense gas were produced, stimulating star formation.
The dusty reddish knot at the lower left of the blue ring probably marks the location of the original nucleus of the galaxy that was hit.
Arp 147 appears in the Arp Atlas of Peculiar Galaxies, compiled by Halton Arp in the 1960s and published in 1966.
This picture was assembled from WFPC2 images taken with three separate filters. The blue, visible-light, and infrared filters are represented by the colors blue, green, and red, respectively.
The galaxy pair was photographed on October 27-28, 2008. Arp 147 lies in the constellation Cetus, and it is more than 400 MLY away from Earth.MareKromium
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ARP194-HST-2009-18-a-full_jpg.jpgArp 194 (Galaxy Cluster)61 visiteTo commemorate the Hubble Space Telescope's 19 years of historic, trailblazing science, the orbiting telescope has photographed a peculiar system of galaxies known as Arp 194. This interacting group contains several galaxies, along with a "cosmic fountain" of stars, gas, and dust that stretches over 100.000 LY.
The Northern (upper) component of Arp 194 appears as a haphazard collection of dusty spiral arms, bright blue star-forming regions, and at least two Galaxy Nuclei that appear to be connected and in the early stages of merging. A third, relatively normal, spiral galaxy appears off to the right.
The Southern (lower) component of the galaxy group contains a single large spiral galaxy with its own blue star-forming regions.
However, the most striking feature of this galaxy troupe is the impressive blue stream of material extending from the Northern Component. This "fountain" contains complexes of "Super Star Clusters", each one of which may contain dozens of individual young Star Clusters. The blue color is produced by the hot, massive stars which dominate the light in each cluster. Overall, the "fountain" contains many millions of stars.
These young star clusters probably formed as a result of the interactions between the galaxies in the Northern Component of Arp 194. The compression of gas involved in galaxy interactions can enhance the star-formation rate and give rise to brilliant bursts of star formation in merging systems.
Hubble's resolution shows clearly that the stream of material lies in front of the southern component of Arp 194, as evidenced by the dust that is silhouetted around the star-cluster complexes. It is therefore not entirely clear whether the southern component actually interacts with the northern pair.
The details of the interactions among the multiple galaxies that make up Arp 194 are complex. The shapes of all the galaxies involved appear to have been distorted, possibly by their gravitational interactions with one another.
Arp 194, located in the constellation Cepheus, resides approximately 600 MLY away from Earth. It contains some of the many interacting and merging galaxies known in our relatively nearby universe. These observations were taken in January of 2009 with the Wide Field Planetary Camera 2. Images taken through blue, green, and red filters were combined to form this picturesque image of galaxy interaction.MareKromium
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ARP_274-HST-2009-14-a-print.jpgGalaxy Triplet Arp 27459 visiteArp 274, also known as NGC 5679, is a system of 3 galaxies that appear to be partially overlapping in the image, although they may be at somewhat different distances. The spiral shapes of 2 of these galaxies appear mostly intact. The third galaxy (to the far left) is more compact, but shows evidence of star formation.
Two of the three galaxies are forming new stars at a high rate. This is evident in the bright blue knots of star formation that are strung along the arms of the galaxy on the right and along the small galaxy on the left.
The largest component is located in the middle of the triplet. It appears as a Spiral Galaxy, which may be barred. The entire system resides at about 400 Million Light-Years away from Earth in the Virgo constellation.
Hubble's Wide Field Planetary Camera 2 was used to image Arp 274. Blue, visible, and infrared filters were combined with a filter that isolates hydrogen emission. The colors in this image reflect the intrinsic color of the different stellar populations that make up the galaxies. Yellowish older stars can be seen in the central bulge of each galaxy.
A bright central cluster of stars pinpoint each nucleus. Younger blue stars trace the spiral arms, along with pinkish nebulae that are illuminated by new star formation. Interstellar dust is silhouetted against the starry population. A pair of foreground stars inside our own Milky Way are at far right.MareKromium
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BlackWidowNebula-SST-PIA03544.jpgThe "Black Widow" Nebula79 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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