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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #391  
Παλιά 18-01-08, 09:27
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Τελευταία φορά Online: 12-11-16 11:12
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Supernova Factory NGC 2770
Credit: A. de Ugarte Postigo (ESO) et al., Dark Cosmology Centre (NBI, KU),
Instituto de Astrofísica de Andalucía (CSIC), University of Hertfordshire

Explanation: The stellar explosions known as supernovae are among the most powerful events in the universe. Triggered by the collapsing core of a massive star or the nuclear demise of a white dwarf, supernovae occur in average spiral galaxies only about once every century. But the remarkable spiral galaxy NGC 2770 has lately produced more than its fair share. Two still bright supernovae and the location of a third, originally spotted in 1999 but now faded from view, are indicated in this image of the edge-on spiral. All three supernovae are now thought to be of the core-collapse variety, but the most recent of the trio, SN2008D, was first detected by the Swift satellite at more extreme energies as an X-ray flash (XRF) or possibly a low-energy version of a gamma-ray burst on January 9th. Located a mere 90 million light-years away in the northern constellation Lynx, NGC 2770 is now the closest galaxy known to host such a powerful supernova event.

Tomorrow's picture: star castle

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  #392  
Παλιά 19-01-08, 09:47
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Τελευταία φορά Online: 12-11-16 11:12
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Starry Night Castle
Credit & Copyright: P-M Hedén

Explanation: The tantalizing Pleiades star cluster seems to lie just beyond the trees above a dark castle tower in this dramatic view of The World at Night. Recorded earlier this month, the starry sky also features bright star Aldebaran below the Pleiades and a small, faint, fuzzy cloud otherwise known as Comet Holmes near picture center at the top of the field. Starry Night Castle might be an appropriate name for the medieval castle ruin in the foreground. But its traditional name is Mörby Castle, found north of Stockholm, near lake Skedviken in Norrtälje, Sweden.

Tomorrow's picture: Sunday's child

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  #393  
Παλιά 20-01-08, 10:35
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Τελευταία φορά Online: 12-11-16 11:12
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Comet McNaught Over Chile
Credit & Copyright: Stéphane Guisard

Explanation: Comet McNaught was perhaps the most photogenic comet of our time. After making quite a show in the northern hemisphere in early January, the comet moved south and developed a long and unusual dust tail that dazzled southern hemisphere observers. In this image, Comet McNaught was captured one year ago above Chile. The bright comet dominates on the left while part of its magnificent tail spreads across the entire picture. From this vantage point in the Andes Mountains, one looks up toward Comet McNaught and a magnificent sky, across at a crescent moon, and down on clouds, atmospheric haze, and the city lights of Santiago. Comet McNaught has glided into the outer Solar System and is now only visible as a speck in a large telescope. The other spectacular comet of 2007, Comet Holmes, has also faded from easy view.

Tomorrow's picture: mercury's horizon

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Σχόλιο :

Μοναδική φωτογραφία!!!
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  #394  
Παλιά 21-01-08, 11:09
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Τελευταία φορά Online: 12-11-16 11:12
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Να και η πρώτη φωτογραφία από τον Ερμή του "Αγγελιοφόρου".

Mercury's Horizon from MESSENGER
Credit: MESSENGER Teams, JHU APL, NASA

Explanation: What would it look like to fly past Mercury? Just such an adventure was experienced last week by the MESSENGER spacecraft during its first flyby of the strange moon-like world nearest the Sun. Pictured above is the limb of Mercury seen by MESSENGER upon approach, from about 1 1/2 Earth diameters away. Visible on the hot and barren planet are many craters, many appeared to be less shallow than similarly sized craters on the Moon. The comparatively high gravity of Mercury helps flatten tall structures like high crater walls. MESSENGER was able to take over 1,000 images of Mercury which will be beamed back to Earth for planetary geologists to study. The robotic MESSENGER spacecraft is scheduled to fly past Mercury twice more before firing its thrusters to enter orbit in 2011.

Tomorrow's picture: open space

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  #395  
Παλιά 22-01-08, 09:59
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Shelf Cloud Over Saskatchewan
Credit: Jeff Kerr

Explanation: Perhaps it's time to go inside. Such thoughts might occur to people witnessing the approach of an impressive shelf cloud. Shelf clouds are typically seen leading thunderstorms, although they may precede any well defined front of relatively cold air. Shelf clouds differ from roll clouds because shelf clouds are attached to a larger cloud system lurking above. Similarly, shelf clouds differ from wall clouds because wall clouds typically trail storm systems. The above pictured shelf cloud was photographed toward the southwest during a trip crossing the prairies of Saskatchewan, Canada on the Trans-Canada Highway in 2001 August. A rising Sun illuminated the impressive cloud from the east as it advanced from the west.

Tomorrow's picture: astronaut reflection

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  #396  
Παλιά 23-01-08, 09:51
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Τελευταία φορά Online: 12-11-16 11:12
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Κάντε κλικ για να δείτε την φωτογραφία σε μεγάλο μέγεθος

Orbiting Astronaut Reflects Earth
Credit: Clayton C. Anderson, Expedition 15 Crew, NASA

Explanation: Astronaut self-portraits can be particularly interesting. Visible in the above picture, working in from the outer borders, are the edges of the reflecting helmet of a space suit, modules of the International Space Station (ISS), the Earth, the arms of Expedition 15 astronaut Clay Anderson, and the digital camera used to snap the image. This picture was taken during the shuttle orbiter Endeavour's mission to expand the space station last August. The large curvature of the Earth appearing in the visor reflection is not the true curvature of our spherical Earth, but rather an artifact of the curve of the space helmet. Earth's horizon appears only slightly curved when viewed from the height of the ISS -- approximately 400 kilometers. The next space shuttle mission to the space station is currently expected to take place next month and includes the installation of the scientific Columbus Laboratory.

Tomorrow's picture: pixels in space

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Σχόλιο :

Πόσο μικρός είναι ο κόσμος μας .....
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  #397  
Παλιά 24-01-08, 10:31
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Andromeda Island Universe
Credit & Copyright: Tony Hallas

Explanation: The most distant object easily visible to the unaided eye is M31, the great Andromeda Galaxy some two and a half million light-years away. But without a telescope, even this immense spiral galaxy - spanning over 200,000 light years - appears as a faint, nebulous cloud in the constellation Andromeda. In contrast, a bright yellow nucleus, dark winding dust lanes, gorgeous blue spiral arms and star clusters are recorded in this stunning telescopic digital mosaic. While even casual skygazers are now inspired by the knowledge that there are many distant galaxies like M31, astronomers seriously debated this fundamental concept only 80 years ago. Were these "spiral nebulae" simply outlying components of our own Milky Way Galaxy or were they instead "island universes" -- distant systems of stars comparable to the Milky Way itself? This question was central to the famous Shapley-Curtis debate of 1920, which was later resolved by observations of M31 in favor of Andromeda, island universe.

Tomorrow's picture: closer to the sky

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  #398  
Παλιά 25-01-08, 09:34
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Winter Night at Pic du Midi
Credit & Copyright: Alain Sallez (picdumidi.org), David Romeuf (Université Lyon 1)

Explanation: This dreamlike view looking south from the historic mountain top Pic du Midi Observatory combines moonlit domes, a winter night sky, and the snowy peaks of the French Pyrenees. Encroaching on the night, lights from the La Mongie ski resort illuminate the mountain slopes nearby while the glow along the distant horizon is from urban areas in southern France and Spain. The night sky features stars of the constellations Orion and Gemini with a bright planet Mars very near the top edge, left of center. The three prominent domes visible (from left to right) house a 0.6 meter telescope reserved for amateur astronomers, a 1 meter telescope that was used to support the Apollo lunar landing missions, and the new, Sun-watching CLIMSO.

Tomorrow's picture: Mercury in Color

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  #399  
Παλιά 26-01-08, 10:11
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Crescent Mercury in Color
Credit: MESSENGER, NASA, JHU APL, CIW

Explanation: Hard to spot against the twilight glow near planet Earth's horizon, a crescent Mercury was imaged close up by the MESSENGER spacecraft early last week. Colors in this remarkable picture were created using data recorded through infrared, red, and violet filters. The combination enhances color differences otherwise not visible to the eye across the innermost planet's cratered surface. In this view, light bluish material seems to surround relatively new craters, contrasting with the mostly drab, brown terrain. Mercury itself is 4,880 kilometers in diameter. The full resolution image shows features as small as 10 kilometers across.

Tomorrow's picture: on the horizon

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Σχόλιο : Μια ακόμα όμορφη φωτογραφία του Ερμή έστειλε ο Messenger, απολαύστε την.
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  #400  
Παλιά 27-01-08, 11:21
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Τελευταία φορά Online: 12-11-16 11:12
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Mercury on the Horizon
Credit & Copyright: Juan Carlos Casado

Explanation: Have you ever seen the planet Mercury? Because Mercury orbits so close to the Sun, it never wanders far from the Sun in Earth's sky. If trailing the Sun, Mercury will be visible low on the horizon for only a short while after sunset. If leading the Sun, Mercury will be visible only shortly before sunrise. So at certain times of the year an informed skygazer with a little determination can usually pick Mercury out from a site with an unobscured horizon. Above, a lot of determination has been combined with a little digital trickery to show Mercury's successive positions during March of 2000. Each picture was taken from the same location in Spain when the Sun itself was 10 degrees below the horizon and superposed on the single most photogenic sunset. Mercury is currently visible in the western sky after sunset, but will disappear in the Sun's glare after a few days.

Tomorrow's picture: painted eclipse

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  #401  
Παλιά 28-01-08, 09:32
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Τελευταία φορά Online: 12-11-16 11:12
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A Solar Eclipse Painting from the 1700s
Painting Credit: Cosmas Damian Asam; Digital Image Copyright: Jay Pasachoff

Explanation: Is this painting the earliest realistic depiction of a total eclipse of the Sun? Some historians believe it is. The above painting was completed in 1735 by Cosmas Damian Asam, a painter and architect famous in early eighteenth century Germany. Clearly drawn is not only a total solar eclipse, but the solar corona and the diamond ring effect visible when sunlight flows only between mountains on the Moon. The person depicted viewing these eclipse phenomena is St. Benedict. Roberta J. M. Olson and Jay Pasachoff have hypothesized that Asam himself may have seen first hand one or all of the total solar eclipses of May 1706, 1724, and 1733. Many facts about our astronomical universe that are taken for granted today have been known -- or accurately recorded -- only during the last millennium. Asam's painting currently hangs in Weltenburg Abbey in Bavaria, Germany.

Tomorrow's picture: open space

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  #402  
Παλιά 29-01-08, 09:41
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West Valley Panorama from the Spirit Rover on Mars
Credit: Mars Exploration Rover Mission, Cornell, JPL, NASA

Explanation: What does Mars look like from here? Last September, before hiking across rugged and slippery terrain to reach its winter hibernation point, the robotic Spirit rover climbed a small plateau known as Home Plate and captured the spectacular vista pictured above. Part of the curious flat-topped Home Plate is visible as the light colored landscape across the panorama's foreground. On the image left, visible about eight kilometers in the distance, is Grissom Hill, while on the left foreground is rock strewn Tsiolkovski Ridge. On the right, at about 800 meters distant, is Husband Hill, a feature already explored by Spirit and notable as the highest point visible in the westward looking panorama. In the inset is a close-up of a small protrusion informally dubbed Little Bigfoot, a motionless rock that has drawn some attention for it superficial appearance to a humanoid life form. Tenacious image explorers might locate Little Bigfoot towards the front left of the high resolution panorama. Spirit successfully reached its energy-conserving winter haven in December.

Tomorrow's picture: Earth spared

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  #403  
Παλιά 30-01-08, 10:27
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Asteroid 2007 TU24 Passes the Earth
Credit: Green Bank Radio Telescope, Arecibo Radio Telescope

Explanation: Asteroid 2007 TU24 passed by the Earth yesterday, posing no danger. The space rock, estimated to be about 250 meters across, coasted by just outside the orbit of Earth's Moon. The passing was not very unusual -- small rocks strike Earth daily, and in 2003 a rock the size of a bus passed inside the orbit of the Moon, being detected only after passing. TU24 was notable partly because it was so large. Were TU24 to have struck land, it might have caused a magnitude seven earthquake and left a city-sized crater. A perhaps larger danger would have occurred were TU24 to have struck the ocean and raised a large tsunami. This radar image was taken two days ago. The Arecibo Radio Telescope in Puerto Rico broadcast radar that was reflected by the asteroid and then recorded by the Byrd Radio Telescope in Green Bank, West Virginia. The resulting image shows TU24 to have an oblong and irregular shape. TU24 was discovered only three months ago, indicating that other potentially hazardous asteroids might lurk in our Solar System currently undetected. Objects like TU24 are hard to detect because they are so faint and move so fast. Humanity's ability to scan the sky to detect, catalog, and analyze such objects has increased notably in recent years.

Tomorrow's picture: pixels in space

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  #404  
Παλιά 31-01-08, 09:29
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Τελευταία φορά Online: 12-11-16 11:12
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Young Star Cluster Westerlund 2
Credit: X-ray; Y.Nazé, G.Rauw, J.Manfroid (Université de Liège), CXC, NASA
Infrared; E.Churchwell (University of Wisconsin), JPL, Caltech, NASA

Explanation: Dusty stellar nursery RCW 49 surrounds young star cluster Westerlund 2 in this remarkable composite skyscape from beyond the visible spectrum of light. Infrared data from the Spitzer Space Telescope is shown in black and white, complimenting the Chandra X-ray image data (in false color) of the hot energetic stars within the cluster's central region. Looking toward the grand southern constellation Centaurus, both views reveal stars and structures hidden from optical telescopes by obscuring dust. Westerlund 2 itself is a mere 2 million years old or less, and contains some of our galaxy's most luminous, massive and therefore short-lived stars. The infrared signatures of proto-planetary disks have also been identified in the intense star forming region. At the cluster's estimated distance of 20,000 light-years, the square marking the Chandra field of view would be about 50 light-years on a side.

Tomorrow's picture: pixels in space

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  #405  
Παλιά 31-01-08, 10:54
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Τελευταία φορά Online: 24-12-09 02:01
Φύλο: Γυναίκα
Η διαθεσή μου τώρα:
ωραιες ολεσ τους γιουπι ξαναμπηκα μετα απο 200 χρονια
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