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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #1606  
Παλιά 15-03-11, 18:10
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Οργανωτής Club
 

Τελευταία φορά Online: 15-01-17 17:24
Φύλο: Άντρας
Η διαθεσή μου τώρα:
Βοηθάει την εικόνα και η καταπληκτική μουσική, το δένει όλο σε ένα μαγικό βίντεο.
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  #1607  
Παλιά 16-03-11, 08:05
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Τελευταία φορά Online: 12-11-16 11:12
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Sideways Galaxy NGC 3628
Image Credit & Copyright: Ken Crawford (Rancho Del Sol Obs.)

Explanation: Dark dust lanes cut across the middle of this gorgeous island universe, a strong hint that NGC 3628 is a spiral galaxy seen sideways. About 35 million light-years away in the northern springtime constellation Leo, NGC 3628 bears the distinction of being the only member of the well known Leo triplet of galaxies not in Charles Messier's famous catalog. Otherwise similar in size to our Milky Way Galaxy, the disk of NGC 3628 is clearly seen to fan out near the edges. A faint arm of material extends to the upper left. The distorted shape and faint tidal tail suggest that NGC 3628 is interacting gravitationally with the other spiral galaxies in the Leo triplet, M66 and M65. The dusty disk of NGC 3628 is also dotted with the telltale reddish hues of star-forming regions in this sharp telescopic view. Explore the full resolution version here.

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  #1608  
Παλιά 17-03-11, 09:42
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Τελευταία φορά Online: 12-11-16 11:12
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Saturn's Serpent Storm
Image Credit & Copyright: Brian Combs

Explanation: Late last year, a new, remarkably bright storm erupted in Saturn's northern hemisphere. Nicknamed "the Serpent Storm", the northern hemisphere disturbance is still going strong and now circles far around the planet. Offering spectacular space-based views to the Saturn-orbiting Cassini spacecraft, the storm shows enough contrast with the banded cloud tops to be visible with even modest ground-based equipment, as seen in this sharp image from Buena Vista, Georgia, USA, planet Earth. Amateur astronomers first spotted the bright storm in early December 2010, with the ringed gas giant rising in predawn skies, and continue to monitor the storm's progress.

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jimil (17-03-11)
  #1609  
Παλιά 18-03-11, 09:50
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Τελευταία φορά Online: 12-11-16 11:12
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Mercury and Jupiter at Sunset
Image Credit & Copyright: Göran Strand

Explanation: When warm sunset hues begin to fade, two celestial beacons now shine in the evening twilight, Mercury and Jupiter. Wandering away from the Sun in planet Earth's sky, Mercury will offer good views this month as spring approaches in the northern hemisphere where the ecliptic plane makes a steep angle with the western horizon. But Jupiter will continue sinking lower in the sky after sunset. In fact, the normally elusive Mercury shines well above Jupiter and the orange sunset glow in this serene sky. Captured earlier this week from the island of of Frösön in northern Sweden, the scene looks across Lake Storsjön toward the village of Hallen and distant mountains. Of course, even better views of Mercury can be had by the MESSENGER spacecraft, now orbiting the Solar System's innermost planet!

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  #1610  
Παλιά 19-03-11, 10:07
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Τελευταία φορά Online: 12-11-16 11:12
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Messier 106
Image Credit & Copyright: R Jay Gabany

Explanation: Close to the Great Bear (Ursa Major) and surrounded by the stars of the Hunting Dogs (Canes Venatici), this celestial wonder was discovered in 1781 by the metric French astronomer Pierre Mechain. Later, it was added to the catalog of his friend and colleague Charles Messier as M106. Modern deep telescopic views reveal it to be an island universe -- a spiral galaxy around 30 thousand light-years across located only about 21 million light-years beyond the stars of the Milky Way. Along with a bright central core, this colorful composite image highlights youthful blue star clusters and reddish stellar nurseries tracing the galaxy's spiral arms. It also shows off remarkable reddish jets of glowing hydrogen gas. In addition to small companion galaxy NGC 4248 (bottom right) background galaxies can be found scattered throughout the frame. M106 (aka NGC 4258) is a nearby example of the Seyfert class of active galaxies, seen across the spectrum from radio to x-rays. Active galaxies are believed to be powered by matter falling into a massive central black hole.

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  #1611  
Παλιά 20-03-11, 10:11
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Τελευταία φορά Online: 12-11-16 11:12
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Parthenon Moon
Image Credit & Copyright: Anthony Ayiomamitis (TWAN)

Explanation: Did you see the Full Moon last night? Near the horizon, the lunar orb may have seemed to loom large, swollen in appearance by the famous Moon illusion. But the Full Moon really was a large Full Moon last night, reaching its exact full phase within an hour of lunar perigee, the point in the Moon's elliptical orbit closest to planet Earth. A similar near perigee Full Moon last occured on December 12, 2008. The difference in the Moon's apparent size as it moves from perigee to apogee, its farthest point from Earth, is about 14 percent. Of course, a nearly Full Moon will rise again tonight, lighting the skies on the date of the Equinox or equal night. The Full Moon also looms large in this well-planned, telescopic lunar portrait. Captured earlier this year, the rising lunar orb is dramatically matched to the 2,500 year old Parthenon, in Athens, Greece.

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Σχόλιο : Είχα την χαρά να δω την φωτογραφία αυτή, λίγο μετά, αφού έγινε η λήψη. Ένα μεγάλο μπράβο στον Κο Αντώνη Αγιομαμίτη, που μας κάνει υπερήφανους.
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  #1612  
Παλιά 21-03-11, 08:49
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Τελευταία φορά Online: 12-11-16 11:12
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The CMB Cold Spot
Credit: WMAP Science Team, NASA

Explanation: How could part of the early universe be so cold? No one is sure, and many astronomers now think that the CMB Cold Spot on the cosmic microwave background (CMB) radiation is not particularly noteworthy. As the early universe expanded and cooled, it suddenly and predictably became transparent. The photons that come to us from that epoch are seen all around us as the CMB. Now this radiation field is quite uniform but does have slight warm and cool spots that tell us a great deal about the early universe that could have imprinted them. Except, possibly, one spot. This CMB Cold Spot, circled above on the WMAP 7-year all-sky map, has attracted attention as possibly being too large and too cold to be easily explained. Published speculation has included spectacular progenitor hypotheses that involve a supervoid, a cosmic texture, or even quantum entanglement with a parallel universe. Quite possibly, though, even a more mundane universe might be expected to show such a statistical peculiarity, and so explanations of the CMB Cold Spot like these might say more about human imagination than the early universe.

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  #1613  
Παλιά 21-03-11, 14:32
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Τελευταία φορά Online: 08-05-17 14:17
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Η διαθεσή μου τώρα:
Καλα, τοσα μαυρα σημεια στην εικονα, σε ΑΥΤΟ κολλήσανε;
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Υπάρχουν σε όλα δύο απόψεις...
Αυτή που λέω εγώ, και η σωστή!
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  #1614  
Παλιά 22-03-11, 09:48
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Τελευταία φορά Online: 12-11-16 11:12
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NGC 6384: Spiral Beyond the Stars
Credit: ESA, Hubble, NASA

Explanation: The universe is filled with galaxies. But to see them astronomers must look out beyond the stars of our galaxy, the Milky Way. For example, consider this colorful telescopic view of spiral galaxy NGC 6384, about 80 million light-years away in the direction of the constellation Ophiuchus. At that distance, NGC 6384 spans an estimated 150,000 light-years. The sharp image shows details in the distant galaxy's blue spiral arms and yellowish core. Still, the individual stars seen in the picture are all in the close foreground, well within our own galaxy. The brighter Milky Way stars show noticeable crosses, or diffraction spikes, caused by the telescope itself.

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Naias (26-03-11)
  #1615  
Παλιά 23-03-11, 10:10
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Τελευταία φορά Online: Σήμερα 10:38
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MWC 922: The Red Square Nebula
Credit & Copyright: Peter Tuthill (Sydney U.) & James Lloyd (Cornell)

Explanation: What could cause a nebula to appear square? No one is quite sure. The hot star system known as MWC 922, however, appears to be embedded in a nebula with just such a shape. The above image combines infrared exposures from the Hale Telescope on Mt. Palomar in California, and the Keck-2 Telescope on Mauna Kea in Hawaii. A leading progenitor hypothesis for the square nebula is that the central star or stars somehow expelled cones of gas during a late developmental stage. For MWC 922, these cones happen to incorporate nearly right angles and be visible from the sides. Supporting evidence for the cone hypothesis includes radial spokes in the image that might run along the cone walls. Researchers speculate that the cones viewed from another angle would appear similar to the gigantic rings of supernova 1987A, possibly indicating that a star in MWC 922 might one day itself explode in a similar supernova.

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  #1616  
Παλιά 24-03-11, 09:22
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Τελευταία φορά Online: 12-11-16 11:12
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Boston Moonrise
Image Credit & Copyright: Dennis Di Cicco (TWAN)

Explanation: Last week's Full Moon was hard to miss. Rising on March 19, its exact full phase occurred within an hour of perigee, the closest point in the Moon's orbit to Earth. As a result it appeared some 14 percent larger and 30 percent brighter than a Full Moon near apogee, the most distant point in the elliptical lunar orbit. Seen here, the near perigee Full Moon still hugs the horizon, distorted by atmospheric refraction as it rises over Boston, Massachusetts, USA. The telescopic night skyscape was shot from Prospect Hill in Waltham, Massachusetts, roughly 10 miles from the Boston skyline. Just to the left of the orange lunar disk is the distinctive control tower at Boston's Logan International Airport. Topped by lights, the tall, twin towers of the cable-stayed Zakim Bridge spanning the Charles River are also included in the scene. If you managed to miss this perigee Full Moon, make a note on your calendar. Your next chance to see the Moon this large and bright, this time at full phase within only a few minutes of lunar perigee, will be next year on May 6.

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jimil (24-03-11)
  #1617  
Παλιά 25-03-11, 11:04
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Τελευταία φορά Online: Σήμερα 10:38
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Auroral Substorm over Yellowknife
Image Credit & Copyright: Kwon, O Chul (TWAN)

Explanation: Intense auroral activity flooded the night with shimmering colors on February 24, captured here from a lodge near the city of Yellowknife in northern Canada. The stunning sequence (left to right) of three all-sky exposures, taken at 30 second intervals, shows rapid changes in dancing curtains of northern lights against a starry background. What makes the northern lights dance? Measurements by NASA's fleet of THEMIS spacecraft indicate that these explosions of auroral activity are driven by sudden releases of energy in the Earth's magnetosphere called magnetic reconnection events. The reconnection events release energy when magnetic field lines snap like rubber bands, driving charged particles into the upper atmosphere. Stretching into space, these reconnection events occur in the magnetosphere on the Earth's night side at a distance about 1/3 of the way to the Moon.

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  #1618  
Παλιά 26-03-11, 08:33
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Τελευταία φορά Online: 12-11-16 11:12
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T Tauri and Hind's Variable Nebula
Image Credit & Copyright: Adam Block, Mt. Lemmon SkyCenter, U. Arizona

Explanation: The yellowish star near center in this remarkable telescopic skyview is T Tauri, prototype of the class of T Tauri variable stars. Nearby it is a dusty yellow cosmic cloud historically known as Hind's Variable Nebula (NGC 1555). Over 400 light-years away, at the edge of a molecular cloud, both star and nebula are seen to vary significantly in brightness but not necessarily at the same time, adding to the mystery of the intriguing region. T Tauri stars are now generally recognized as young (less than a few million years old), sun-like stars still in the early stages of formation. To further complicate the picture, infrared observations indicate that T Tauri itself is part of a multiple system and suggest that the associated Hind's Nebula may also contain a very young stellar object. The naturally colored image spans about 4 light-years at the estimated distance of T Tauri.

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jimil (26-03-11)
  #1619  
Παλιά 27-03-11, 09:16
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Τελευταία φορά Online: 12-11-16 11:12
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Valles Marineris: The Grand Canyon of Mars
Credit: Viking Project, USGS, NASA

Explanation: The largest canyon in the Solar System cuts a wide swath across the face of Mars. Named Valles Marineris, the grand valley extends over 3,000 kilometers long, spans as much as 600 kilometers across, and delves as much as 8 kilometers deep. By comparison, the Earth's Grand Canyon in Arizona, USA is 800 kilometers long, 30 kilometers across, and 1.8 kilometers deep. The origin of the Valles Marineris remains unknown, although a leading hypothesis holds that it started as a crack billions of years ago as the planet cooled. Several geologic processes have been identified in the canyon. The above mosaic was created from over 100 images of Mars taken by Viking Orbiters in the 1970s.

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jimil (27-03-11)
  #1620  
Παλιά 28-03-11, 09:00
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Τελευταία φορά Online: 12-11-16 11:12
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Time-Lapse Auroras Over Norway
Credit & Copyright: Terje Sørgjerd; Music: Gladiator Soundtrack: Now we are Free

Explanation: Sometimes, after your eyes adapt to the dark, a spectacular sky appears. Such was the case earlier this month when one of the largest auroral displays in recent years appeared over northern locations like the border between Norway and Russia. Pictured in the above time-lapse movie, auroras flow over snow covered landscapes, trees, clouds, mountains and lakes found near Kirkenes, Norway. Many times the auroras are green, as high energy particles strike the Earth's atmosphere, causing the air to glow as electrons recombine with their oxygen hosts. Other colors are occasionally noticeable as atmospheric nitrogen also becomes affected. In later sequences the Moon and rising stars are also visible. With the Sun expected to become ever more active over the next few years, there may be many opportunities to see similarly spectacular auroras personally, even from areas much closer to the equator.

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Σχόλιο : Φανταστικό !!!
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