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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #781  
Παλιά 13-01-09, 09:39
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Τελευταία φορά Online: Σήμερα 10:54
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Largest Moon of 2009 Over the Alps
Credit & Copyright: Vincent Jacques Sky Shows

Explanation: A larger moon will not be seen this year. This past weekend, the largest full Moon of 2009 could be seen from almost any clear location on planet Earth at night. The high angular extent of the full Moon was caused by the Moon being unusually close to Earth during its full phase. Because the Moon circles the Earth in an elliptical orbit, its angular size depends on how close the Moon is to closest approach (perigee) or furthest distance (apogee). Even so, the Moon's was only about 30 percent larger in area and brightness than a more typical full Moon. In the above image, a dramatically positioned Moon was photographed rising above the Alps from Breil-sur-Roya in the southeast of France. Taken with an ordinary digital camera but extraordinary timing, the image also captured a crossing jet plane. The last full Moon, in 2008 December, was the largest full moon of 2008.

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  #782  
Παλιά 14-01-09, 09:29
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Τελευταία φορά Online: 12-11-16 11:12
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NGC 2170: Celestial Still Life
Credit & Copyright: Thomas V. Davis (tvdavisastropix.com)

Explanation: Is this a painting or a photograph? In this beautiful celestial still life composed with a cosmic brush, dusty nebula NGC 2170 shines near the image center. Reflecting the light of nearby hot stars, NGC 2170 is joined by other bluish reflection nebulae, a red emission region, many dark absorption nebulae, and a backdrop of colorful stars. Like the common household items still life painters often choose for their subjects, the clouds of gas, dust, and hot stars pictured here are also commonly found in this setting - a massive, star-forming molecular cloud in the constellation Monoceros. The giant molecular cloud, Mon R2, is impressively close, estimated to be only 2,400 light-years or so away. At that distance, this canvas would be over 40 light-years across.

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  #783  
Παλιά 15-01-09, 08:07
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Τελευταία φορά Online: 12-11-16 11:12
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Suspension Bridge Solargraph
Credit & Copyright: Justin Quinnell

Explanation: If every picture tells a story, this one might make a novel. The six month long exposure compresses the time from December 17, 2007 to June 21, 2008 into a single point of view. Dubbed a solargraph, the remarkable image was recorded with a simple pinhole camera made from a drink can lined with a piece of photographic paper. The Clifton Suspension Bridge over the Avon River Gorge in Bristol, UK emerges from the foreground, but rising and setting each day the Sun arcs overhead, tracing a glowing path through the sky. Cloud cover causes dark gaps in the daily Sun trails. In December, the Sun trails begin lower down and are short, corresponding to a time near the northern hemisphere's winter solstice date. They grow longer and climb higher in the sky as the June 21st summer solstice approaches.

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  #784  
Παλιά 16-01-09, 09:48
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Τελευταία φορά Online: 12-11-16 11:12
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ISS: Reflections of Earth
Credit & Copyright: Ralf Vandebergh

Explanation: Remarkable details are visible in this view of the orbiting International Space Station (ISS), recorded with a small telescope on planet Earth through a clear twilight sky. Seen on December 27th at about 75 degrees elevation and some 350 kilometers above the planet's surface, parts of the station, including the Kibo and Columbus science modules, even seem to reflect the Earth's lovely bluish colors. The image also shows off large power generating solar arrays on the station's 90 meter long integrated truss structure Just put your cursor over the picture to identify some of the major parts of the ISS.

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  #785  
Παλιά 17-01-09, 10:50
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IC 410 and NGC 1893
Credit & Copyright: Jacob Bassøe

Explanation: Dusty emission nebula IC 410 lies about 12,000 light-years away in the northern constellation Auriga. The cloud of glowing gas is over 100 light-years across, sculpted by stellar winds and radiation from embedded open star cluster NGC 1893. Formed in the interstellar cloud a mere 4 million years ago, bright cluster stars are seen just below the prominent dark dust cloud near picture center. Notable near the 7 o'clock position are two relatively dense streamers of material trailing away from the nebula's central regions. Potentially sites of ongoing star formation, these cosmic tadpole shapes are about 10 light-years long. Emission from sulfur atoms is shown in red, hydrogen atoms in green, and oxygen in blue hues in this false-color, narrow band composite image.

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  #786  
Παλιά 18-01-09, 10:07
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Saturn's Hyperion: A Moon with Odd Craters
Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA

Explanation: What lies at the bottom of Hyperion's strange craters? Nobody knows. To help find out, the robot Cassini spacecraft now orbiting Saturn swooped past the sponge-textured moon in late 2005 and took an image of unprecedented detail. That image, shown above in false color, shows a remarkable world strewn with strange craters and a generally odd surface. The slight differences in color likely show differences in surface composition. At the bottom of most craters lies some type of unknown dark material. Inspection of the image shows bright features indicating that the dark material might be only tens of meters thick in some places. Hyperion is about 250 kilometers across, rotates chaotically, and has a density so low that it might house a vast system of caverns inside.

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  #787  
Παλιά 19-01-09, 09:09
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Τελευταία φορά Online: 12-11-16 11:12
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Methane Discovered in the Atmosphere of Mars
Credit: NASA

Explanation: Why is there methane on Mars? No one is sure. An important confirmation that methane exists in the atmosphere of Mars occurred last week, bolstering previous controversial claims made as early as 2003. The confirmation was made spectroscopically using large ground-based telescopes by finding precise colors absorbed on Mars that match those absorbed by methane on Earth. Given that methane is destroyed in the open martian air in a matter of years, the present existence of the fragile gas indicates that it is currently being released, somehow, from the surface of Mars. One prospect is that microbes living underground are creating it, or created in the past. If true, this opens the exciting possibility that life might be present under the surface of Mars even today. Given the present data, however, it is also possible that a purely geologic process, potentially involving volcanism or rust and not involving any life forms, is the methane creator. Pictured above is an image of Mars superposed with a map of the recent methane detection.

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  #788  
Παλιά 20-01-09, 09:34
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Bonestell Panorama from Mars
Credit: Mars Exploration Rover Mission, Cornell, JPL, NASA

Explanation: If you could stand on Mars -- what could you see? One memorable vista might be the above 360-degree panoramic image taken by the robotic Spirit rover over the last year. The above image involved over 200 exposures and was released as part of Spirit's five year anniversary of landing on the red planet. The image was taken from the spot that Spirit stopped to spend the winter, near an unusual plateau called Home Plate. Visible on the annotated image are rocks, hills, peaks, ridges, plains inside Gusev crater, and previous tracks of the rolling Spirit rover. The image color has been closely matched to what a human would see, and named for the famous space artist Chesley Bonestell.

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  #789  
Παλιά 21-01-09, 09:09
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A Lenticular Cloud Over New Zealand
Credit & Copyright: Chris Picking (Starry Night Skies Photography)

Explanation: What's happening above those mountains? Several clouds are stacked up into one striking lenticular cloud. Normally, air moves much more horizontally than it does vertically. Sometimes, however, such as when wind comes off of a mountain or a hill, relatively strong vertical oscillations take place as the air stabilizes. The dry air at the top of an oscillation may be quite stratified in moisture content, and hence forms clouds at each layer where the air saturates with moisture. The result can be a lenticular cloud with a strongly layered appearance. The above picture was taken in 2002 looking southwest over the Tarurua Range mountains from North Island, New Zealand.

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  #790  
Παλιά 22-01-09, 09:30
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Planetary Nebula NGC 2818
Credit: NASA, ESA, Hubble Heritage Team (STScI / AURA)

Explanation: NGC 2818 is a beautiful planetary nebula, the gaseous shroud of a dying sun-like star. It could well offer a glimpse of the future that awaits our own Sun after spending another 5 billion years or so steadily using up hydrogen at its core, and then finally helium, as fuel for nuclear fusion. Curiously, NGC 2818 seems to lie within a sparse open star cluster, NGC 2818A, that is some 10,000 light-years distant toward the southern constellation Pyxis (Compass). Since open star clusters disperse after only a few hundred million years, this one must be exceptionally old to have one of its member stars evolve to the planetary nebula stage. At the distance of the star cluster, planetary nebula NGC 2818 would be about 4 light-years across. The Hubble image is a composite of exposures through narrow-band filters, presenting emission from nitrogen, hydrogen, and oxygen atoms in the nebula as red, green, and blue hues.

Πηγή: antwrp.gsfc.nasa.gov
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  #791  
Παλιά 22-01-09, 11:37
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Τελευταία φορά Online: 08-05-17 14:17
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Η διαθεσή μου τώρα:
Πισω απο το μαυρο του διαστηματος υπαρχει ουρανος!!
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  #792  
Παλιά 23-01-09, 08:41
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Τελευταία φορά Online: 12-11-16 11:12
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Globular Cluster NGC 2419
Credit & Copyright: Richard Hammar

Explanation: Of three objects prominent in this thoughtful telescopic image, a view toward the stealthy constellation Lynx, two (the spiky ones) are nearby stars. The third is the remote globular star cluster NGC 2419, at distance of nearly 300,000 light-years. NGC 2419 is sometimes called "the Intergalactic Wanderer", an appropriate title considering that the distance to the Milky Way's satellite galaxy, the Large Magellanic Cloud, is only about 160,000 light-years. Roughly similar to other large globular star clusters like Omega Centauri, NGC 2419 is itself intrinsically bright, but appears faint because it is so far away. NGC 2419 may really have an extragalactic origin as, for example, the remains of a small galaxy captured and disrupted by the Milky Way. But its extreme distance makes it difficult to study and compare its properties with other globular clusters that roam the halo of our Milky Way galaxy.

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  #793  
Παλιά 24-01-09, 09:32
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The Bubble Nebula
Credit & Copyright: Kent Wood

Explanation: Blown by the wind from a massive star, this interstellar apparition has a surprisingly familiar shape. Cataloged as NGC 7635, it is also known simply as The Bubble Nebula. This colorful telescopic image includes a long exposure through a hydrogen alpha filter to reveal details of the cosmic bubble and its environment. Although it looks delicate, the 10 light-year diameter bubble offers evidence of violent processes at work. Above and right of the Bubble's center is a bright, hot, Wolf-Rayet star with a mass 10 to 20 times that of the Sun. A fierce stellar wind and intense radiation from the star has blasted out the structure of glowing gas against denser material in a surrounding molecular cloud. The intriguing Bubble Nebula lies a mere 11,000 light-years away toward the boastful constellation Cassiopeia.

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  #794  
Παλιά 25-01-09, 10:03
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Annular Eclipse: The Ring of Fire
Credit & Copyright: Dennis L. Mammana (TWAN)

Explanation: Tomorrow, a few lucky people may see a "ring of fire." That's a name for the central view of an annular eclipse of the Sun by the Moon. At the peak of this eclipse, the middle of the Sun will appear to be missing and the dark Moon will appear to be surrounded by the bright Sun. This will only be visible, however, from a path that crosses the southern Indian Ocean. From more populated locations, southern Africa and parts of Australia, most of the Moon will only appear to take a bite out the Sun. Remember to never look directly at the Sun even during an eclipse. An annular eclipse occurs instead of a total eclipse when the Moon is on the far part of its elliptical orbit around the Earth. The next annular eclipse of the Sun will take place in 2010 January, although a total solar eclipse will occur this July. Pictured above, a spectacular annular eclipse was photographed behind palm trees on 1992 January.

Πηγή

Σχόλιο 1.: Βασίλη ξέρεις που θα κάνουμε εκδρομή τον Ιανουάριο του 2010 ε;
Σχόλιο 2.: Πρέπει να υπάρχει ένα λάθος στο link και δεν βγαίνει η φωτογραφία σε μεγάλο μέηεθος/
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Τελευταία επεξεργασία από το χρήστη Xenios : 25-01-09 στις 10:05
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  #795  
Παλιά 26-01-09, 09:10
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AE Aurigae and the Flaming Star Nebula
Credit & Copyright: Jorge Garcia

Explanation: Is star AE Aurigae on fire? No. Even though AE Aurigae is named the flaming star, the surrounding nebula IC 405 is named the Flaming Star Nebula, and the region appears to harbor red smoke, there is no fire. Fire, typically defined as the rapid molecular acquisition of oxygen, happens only when sufficient oxygen is present and is not important in such high-energy, low-oxygen environments such as stars. The material that appears as smoke is mostly interstellar hydrogen, but does contain smoke-like dark filaments of carbon-rich dust grains. The bright star AE Aurigae, visible near the nebula center, is so hot it is blue, emitting light so energetic it knocks electrons away from surrounding gas. When a proton recaptures an electron, red light is frequently emitted, as seen in the surrounding emission nebula. Pictured above, the Flaming Star nebula lies about 1,500 light years distant, spans about 5 light years, and is visible with a small telescope toward the constellation of the Charioteer (Auriga).

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