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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #256  
Παλιά 04-10-07, 08:08
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας


50th Anniversary of Sputnik: Traveling Companion
Photo Credit: Courtesy NSSDC, NASA

Explanation: Sputnik means "traveling companion". Despite the innocuous sounding name, the launch of planet Earth's first artificial moon, Sputnik 1, by the Soviet Union on October 4, 1957, changed the world and set in motion events which resulted in the creation of NASA and the race to the Moon. Sputnik 1 was a 184 pound, 22 inch diameter sphere with four whip antennas connected to battery powered transmitters. The transmitters broadcast a continuous "beeping" signal to an astounded earthbound audience for 23 days. A short month later, on November 3, the Soviet Union followed this success by launching a dog into orbit aboard Sputnik 2.

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  #257  
Παλιά 05-10-07, 08:25
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας


Starburst Cluster in NGC 3603
Credit: NASA, ESA, Hubble Heritage (STScI/AURA)-ESA/ Hubble Collaboration
Acknowledgment: J. Maiz Apellaniz (Inst. Astrofisica Andalucia) et al., & Davide de Martin (skyfactory.org)

Explanation: A mere 20,000 light-years from the Sun lies NGC 3603, a resident of the nearby Carina spiral arm of our Milky Way Galaxy. NGC 3603 is well known to astronomers as one of the Milky Way's largest star-forming regions. The central open star cluster contains thousands of stars more massive than our Sun, stars that likely formed only one or two million years ago in a single burst of star formation. In fact, nearby NGC 3603 is thought to contain a convenient example of the massive star clusters that populate much more distant starburst galaxies. Surrounding the cluster are natal clouds of glowing interstellar gas and obscuring dust, sculpted by energetic stellar radiation and winds. Recorded by the Hubble's Advanced Camera for Surveys, the image spans about 17 light-years.

Tomorrow's picture: light-weekend

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  #258  
Παλιά 06-10-07, 09:42
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Τελευταία φορά Online: 12-11-16 11:12
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X-ray Stars of Orion
Credit: E.Feigelson & K.Getman (PSU) et al., CXO, NASA

Explanation: The stars of Orion shine brightly in visible light in planet Earth's night sky. The constellation harbors the closest large stellar nursery, the Great Nebula of Orion, a mere 1,500 light-years away. In fact, the apparently bright clump of stars near the center of this false color Chandra x-ray telescope picture are the massive stars of the Trapezium - the young star cluster which powers much of the nebula's visible-light glow. The stars shown in blue and orange are young sun-like stars; prodigious sources of x-rays thought to be produced in hot stellar coronae and surface flares in a young star's strong magnetic field. Our middle-aged Sun itself was probably thousands of times brighter in x-rays when, like the Trapezium stars, it was only a few million years old. The x-ray image spans about 2.5 light-years across the central region of the Orion Nebula.

Tomorrow's picture: two million galaxies

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  #259  
Παλιά 07-10-07, 09:17
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Τελευταία φορά Online: 12-11-16 11:12
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Two Million Galaxies
Credit & Copyright: S. Maddox (Nottingham U.) et al. APM Survey, Astrophys. Dept. Oxford U.

Explanation: Our universe is filled with galaxies. Galaxies -- huge conglomerations of stars, gas, dust -- and mysterious dark matter are the basic building blocks of the large-scale universe. Although distant galaxies move away from each other as the universe expands, gravity attracts neighboring galaxies to each other, forming galaxy groups, clusters of galaxies, and even larger expansive filaments. Some of these structures are visible on one of the most comprehensive maps of the sky ever made in galaxies: the APM galaxy survey map completed in the early 1990s. Over 2 million galaxies are depicted above in a region 100 degrees across centered toward our Milky Way Galaxy's south pole. Bright regions indicate more galaxies, while bluer colors denote larger average galaxies. Dark ellipses have been cut away where bright local stars dominate the sky. Many scientific discoveries resulted from analyses of the map data, including that the universe was surprisingly complex on large scales.

Tomorrow's picture: cosmic blender

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  #260  
Παλιά 08-10-07, 07:39
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Τελευταία φορά Online: 12-11-16 11:12
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Galaxy NGC 474: Cosmic Blender
Credit & Copyright: Mischa Schirmer

Explanation: What's happening to galaxy NGC 474? The multiple layers of emission appear strangely complex and unexpected given the relatively featureless appearance of the elliptical galaxy in less deep images. The cause of the shells is currently unknown, but possibly tidal tails related to debris left over from absorbing numerous small galaxies in the past billion years. Alternatively the shells may be like ripples in a pond, where the ongoing collision with the spiral galaxy to the right of NGC 474 is causing density waves to ripple though the galactic giant. Regardless of the actual cause, the above image dramatically highlights the increasing consensus that the outer halos of most large galaxies are not really smooth but have complexities induced by frequent interactions with -- and accretions of -- smaller nearby galaxies. The halo of our own Milky Way Galaxy is one example of such unexpected complexity. NGC 474 spans about 250,000 light years and lies about 100 million light years distant toward the constellation of the Fish Pisces.

Tomorrow's picture: aurora lake

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  #261  
Παλιά 09-10-07, 07:49
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Τελευταία φορά Online: 12-11-16 11:12
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Κάντε κλικ για να δείτε την καταπληκτική φωτογραφία σε μεγάλη ανάλυση

Aurora, Stars, Meteor, Lake, Alaska
Credit & Copyright: Bud Kuenzli

Explanation: Sometimes, after your eyes adapt to the dark, a spectacular sky appears. In this case, a picturesque lake lies in front of you, beautiful green aurora flap high above you, brilliant stars shine far in the distance, and, for a brief moment, a bright meteor streaks by. This digitally fused breathtaking panorama was captured late last month across one of the Chena Lakes in North Pole, Alaska, USA, and includes the Pleiades open cluster of stars on the image right. The shot is unusual not only for the many wonders it has captured simultaneously, but because lakes this far north tend to freeze and become non-reflecting before a sky this dark can be photographed.

Tomorrow's picture: cosmic blender

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  #262  
Παλιά 09-10-07, 10:02
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Mέλος
 

Τελευταία φορά Online: 26-01-08 20:39
Φύλο: Άντρας
Η διαθεσή μου τώρα:
Πραγματικα καταπληκτικη φωτογραφία!
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  #263  
Παλιά 09-10-07, 10:15
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Τελευταία φορά Online: 19-01-21 20:02
Φύλο: Άντρας
Η διαθεσή μου τώρα:
Απίστευτη!
Εκτός ότι έπιασε την κίνηση κάποιων αστεριών λόγω της ταχύτητας που χρησιμοποιήθηκε, πέτυχε και διάτοντα αστέρα!
Μου φαίνεται θα κάνω μία βόλτα από κάτι φίλους στη Φιλανδία...
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Για λόγους οικονομίας έσβησε το φως στο τούνελ...
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  #264  
Παλιά 09-10-07, 10:21
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Οργανωτής Club
 

Φύλο: Γυναίκα
Η διαθεσή μου τώρα:
Αρχική Δημοσίευση από Diamond Εμφάνιση μηνυμάτων
Μου φαίνεται θα κάνω μία βόλτα από κάτι φίλους στη Φιλανδία...
Να πας! Αν μπορείς να πας!
Θα μπορούσα να χαζεύω με τις ώρες το aurora borealis. Είναι μαγευτικό. Δεν περιγράφεται σε φωτογραφίες.
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Δε χάνεται η ελπίδα τελευταία... Τελευταία χάνεται η ψυχή όταν χάσει την ελπίδα της...
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  #265  
Παλιά 09-10-07, 10:35
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας
Θα την ψήφιζα μια από τις καλύτερες φωτογραφίες που φιλοξενήσαμε στο θέμα αυτό.

Το κρίμα είναι που οι διαστάσεις της δεν μας επιτρέπουν να την κάνουμε wallpaper εκτός και αν κόψουμε πολύ τα άκρα.
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  #266  
Παλιά 10-10-07, 07:15
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Τελευταία φορά Online: 12-11-16 11:12
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The Strange Tailing Side of Saturn's Iapetus
Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA

Explanation: What has happened to Saturn's moon Iapetus? Vast sections of this strange world are dark as coal, while others are as bright as ice. The composition of the dark material is unknown, but infrared spectra indicate that it possibly contains some dark form of carbon. Iapetus also has an unusual equatorial ridge that makes it appear like a walnut. To help better understand this mysterious moon, NASA directed the robotic Cassini spacecraft orbiting Saturn to swoop within 2,000 kilometers just last month. Pictured above, from about 75,000 kilometers out, Cassini's trajectory allowed unprecedented imaging of the hemisphere of Iapetus that is always trailing. A huge impact crater seen in the south spans a tremendous 450 kilometers and appears superposed on an older crater of similar size. The dark material is seen increasingly coating the easternmost part of Iapetus, darkening craters and highlands alike. Close inspection indicates that the dark coating typically faces the moon's equator. Whether Iapetus' colors are the result of unusual episodes of internal volcanism or external splattering remains unknown. This and other images from Cassini's Iapetus flyby are being studied for even greater clues.

Tomorrow's picture: open space

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  #267  
Παλιά 11-10-07, 07:50
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Τελευταία φορά Online: 12-11-16 11:12
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Bright Planets, Crescent Moon
Credit & Copyright: Jay Ouellet

Explanation: Early risers are currently enjoying the sight of dazzling Venus, near the eastern horizon as the morning star. Recorded on October 7, this predawn skyview does feature Venus at the upper right. It also includes a crescent Moon and Saturn (lower left). In fact, holding your fist at arms length would have easily covered both planets and the Moon in this 5 degree wide field. Earthshine, sunlight reflected from planet Earth's dayside, illuminates features on the lunar nightside. A close inspection of Saturn itself reveals a nearby pinpoint of light corresponding to Saturn's large moon Titan. Though the Moon has moved on, the tight triangle formed by Venus, Saturn, and Regulus (top), alpha star in the constellation Leo, will continue to look impressive in early morning skies over the next few days. Early bird astrophotographer Jay Ouellet also described Mars as a "brilliant red diode" in his dark country sky east of Quebec City, Canada.

Count the Stars: The Great World Wide Star Count
Tomorrow's picture: galaxy field

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  #268  
Παλιά 12-10-07, 07:51
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Τελευταία φορά Online: 12-11-16 11:12
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The Whale and The Hockey Stick
Credit & Copyright: Josef Poepsel, Stefan Binnewies (Capella Observatory)

Explanation: NGC 4631 is a big beautiful spiral galaxy seen edge-on (top right) only 25 million light-years away towards the small northern constellation Canes Venatici. This galaxy's slightly distorted wedge shape suggests to some a cosmic herring and to others the popular moniker of The Whale Galaxy. Either way, it is similar in size to our own Milky Way. In this gorgeous color image, the Whale's dark interstellar dust clouds, yellowish core, and young blue star clusters are easy to spot. A companion galaxy, the small elliptical NGC 4627, appears above the Whale Galaxy. At the lower left is another distorted galaxy, the hockey stick-shaped NGC 4656. The distortions and mingling trails of gas detected at other wavelengths suggest that all three galaxies have had close encounters with each other in their past. The Whale Galaxy is also known to have spouted a halo of hot gas glowing in x-rays.

Count the Stars: The Great World Wide Star Count
Tomorrow's picture: light-weekend

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  #269  
Παλιά 13-10-07, 07:42
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Τελευταία φορά Online: 12-11-16 11:12
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Enceladus Ice Geysers
Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA

Explanation: Ice geysers erupt on Enceladus, bright and shiny inner moon of Saturn. Shown in this false-color image, a backlit view of the moon's southern limb, the majestic, icy plumes were discovered by instruments on the Cassini Spacecraft during close encounters with Enceladus in November of 2005. Eight source locations for these geysers have now been identified along substantial surface fractures in the moon's south polar region. Researchers suspect the geysers arise from near-surface pockets of liquid water with temperatures near 273 kelvins (0 degrees C). That's hot when compared to the distant moon's surface temperature of 73 kelvins (-200 degrees C). The cryovolcanism is a dramatic sign that tiny, 500km-diameter Enceladus is surprisingly active. Enceladus ice geysers also likely produce Saturn's faint but extended E ring.

Tomorrow's picture: eight burst

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  #270  
Παλιά 14-10-07, 07:34
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Τελευταία φορά Online: 12-11-16 11:12
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NGC 3132: The Eight Burst Nebula
Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

Explanation: It's the dim star, not the bright one, near the center of NGC 3132 that created this odd but beautiful planetary nebula. Nicknamed the Eight-Burst Nebula and the Southern Ring Nebula, the glowing gas originated in the outer layers of a star like our Sun. In this representative color picture, the hot blue pool of light seen surrounding this binary system is energized by the hot surface of the faint star. Although photographed to explore unusual symmetries, it's the asymmetries that help make this planetary nebula so intriguing. Neither the unusual shape of the surrounding cooler shell nor the structure and placements of the cool filamentary dust lanes running across NGC 3132 are well understood.

Tomorrow's picture: jupiter jumble

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