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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #1666  
Παλιά 06-05-11, 08:17
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Τελευταία φορά Online: 12-11-16 10:12
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2011 May 6

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Farther Along

Credit: NASA, JPL-Caltech
Explanation: What is humanity's most distant spacecraft? Launched in 1977, Voyager 1 now holds that distinction at 17.5 billion kilometers from the Sun. That corresponds to 16 light-hours or 117 Astronomical Units (AU). This graphic shows the position of Voyager 1 relative to the outer solar system (top and side views) along with other distant spacecraft contenders. Next most distant, Pioneer 10 is about 15.4 billion kilometers from the Sun, though on the opposite side of the solar system from Voyager 1. Voyager 2 and Pioneer 11, both also well beyond the orbit of Pluto, are 14.2 billion and 12.4 billion kilometers from the Sun respectively. Still outbound for Pluto, the New Horizons spacecraft is presently 3 billion kilometers from the Sun and will encounter the Pluto system in July of 2015. All these spacecraft have used sling-shot style gravity assist maneuvers to increase their speeds through the outer solar system. Voyager 1 is moving the fastest though, escaping the solar system at about 17 kilometers per second. Still operational, both Voyagers are headed towards the outer boundary of the solar system, in search of the heliopause and the beginning of interstellar space.

Tomorrow's picture: dawn of the planets

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  #1667  
Παλιά 08-05-11, 08:21
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2011 May 8

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Shadow of a Martian Robot

Credit: Mars Exploration Rover Mission, JPL, NASA
Explanation: What if you saw your shadow on Mars and it wasn't human? Then you might be the Opportunity rover currently exploring Mars. Opportunity and sister robot Spirit have been probing the red planet since early 2004, finding evidence of ancient water, and sending breathtaking images across the inner Solar System. Pictured above, Opportunity looks opposite the Sun into Endurance Crater and sees its own shadow. Two wheels are visible on the lower left and right, while the floor and walls of the unusual crater are visible in the background. Although the Spirit rover is now stuck, Opportunity is continuing on its long trek to expansive Endeavor crater.

Tomorrow's picture: wonder and mystery

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  #1668  
Παλιά 09-05-11, 07:54
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2011 May 9

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Wonder and Mystery above the Very Large Telescopes
Credit: Yuri Beletsky (ESO)
Explanation: What's that bright orange dot above the large telescope on the right? Even seasoned sky enthusiasts might ponder the origin of the orange orb seen by scrolling across this panoramic image, taken last December. Perhaps identifying known objects will help. To start, on the far left is a diagonal band of light known as zodiacal light, sunlight reflected off of dust orbiting in the inner Solar System. The bright white spot on the left, just above the horizon, is Venus, which also glows by reflected sunlight. Rising diagonally from the ground to the right of Venus is the band of our Milky Way Galaxy. In the image, the band, which usually stretches dramatically overhead, appears to arch above the elevated Chilean landscape. Under the Milky Way arch, toward the left, lie both the Large and Small Magellanic Cloud galaxies, while toward the right lies the constellation of Orion surrounded by the red ring of Barnard's Loop. On the ground, each of the four Very Large Telescopes is busy keeping an eye on the distant universe. The orange spot -- it's the Moon. The image was taken during a total lunar eclipse when the normally bright full moon turned into a faint orb tinted orange by the intervening Earth's atmosphere.

Tomorrow's picture: pixels in space

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  #1669  
Παλιά 10-05-11, 08:49
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2011 May 10

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Gravity Probe B Confirms the Existence of Gravitomagnetism

Credit: Gravity Probe B Team, Stanford, NASA
Explanation: Does gravity have a magnetic counterpart? Spin any electric charge and you get a magnetic field. Spin any mass and, according to Einstein, you should get a very slight effect that acts something like magnetism. This effect is expected to be so small that it is beyond practical experience and ground laboratory measurement. In a bold attempt to directly measure gravitomagnetism, NASA launched in 2004 the smoothest spheres ever manufactured into space to see how they spin. These four spheres, each roughly the size of a ping-pong ball, are the key to the ultra-precise gyroscopes at the core of Gravity Probe B. Last week, after accounting for persistent background signals, the results were announced -- the gyroscopes precessed at a rate consistent with the gravitational predictions of Einstein's General Theory of Relativity. The results, which bolster existing findings, may have untold long term benefits as well as shorter term benefits such as better clocks and global positioning trackers.

Tomorrow's picture: open space

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  #1670  
Παλιά 11-05-11, 09:19
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Τελευταία φορά Online: Χθες 20:54
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Astronomy Picture of the Day



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The Southern Cliff in the Lagoon
Credit: Julia I. Arias and Rodolfo H. Barbá (Dept. Fisica, Univ. de La Serena), ICATE-CONICET, Gemini Observatory/AURA

Explanation: Undulating bright ridges and dusty clouds cross this close-up of the nearby star forming region M8, also known as the Lagoon Nebula. A sharp, false-color composite of narrow band visible and broad band near-infrared data from the 8-meter Gemini South Telescope, the entire view spans about 20 light-years through a region of the nebula sometimes called the Southern Cliff. The highly detailed image explores the association of many newborn stars imbedded in the tips of the bright-rimmed clouds and Herbig-Haro objects. Abundant in star-forming regions, Herbig-Haro objects are produced as powerful jets emmitted by young stars in the process of formation heat the surrounding clouds of gas and dust. The cosmic Lagoon is found some 5,000 light-years away toward constellation Sagittarius and the center of our Milky Way Galaxy.

Tomorrow's picture: pixels in space


Πηγή
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VmF Skisters of Mercy ©
An eye for an eye, will make us all blind... Mahatma Ghandi
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  #1671  
Παλιά 12-05-11, 08:42
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2011 May 12

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Enceladus Looms

Credit: Cassini Imaging Team, ISS, JPL, ESA, NASA
Explanation: A sunlit crescent of Saturn's moon Enceladus looms above the night side of Saturn in this dramatic image from the Cassini spacecraft. Captured on August 13, 2010 looking in a sunward direction during a flyby of the icy moon, the view also traces layers in the upper atmosphere of Saturn scattering sunlight along the planet's bright limb. Closer to the spacecraft than Saturn, Enceladus is a mere 60,000 kilometers from Cassini's camera. The south polar region of the 500 kilometer-diameter moon is illuminated, including plumes of water vapor and icy particles spraying above the long fissures in the moon's surface. The fissures have been dubbed tiger stripes. First discovered in Cassini images from 2005, the plumes are strong evidence that liquid water exists near the surface of surprisingly active Enceladus.

Tomorrow's picture: triskaidekaphobia

Πηγή
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  #1672  
Παλιά 13-05-11, 09:11
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Γενική πρόγνωση καιρού για Παρασκευή 13/05/2011

Βελτιωμένο καιρό στις περισσότερες περιοχές της χώρας, λίγες βροχές στο Νότιο και Ανατολικό Αιγαίο και πιθανόν πρόσκαιρες καταιγίδες στα ορεινά της Παλοποννήσου, της Ανατολικής Μακεδονίας και της Θράκης κατά τις θερμές ώρες της ημέρας, περιμένουμε την Παρασκευή 13 Μαΐου 2011.

Η θερμοκρασία σε μικρή άνοδο, θα κυμανθεί στη Βόρεια Ελλάδα από 7 έως 25 βαθμούς, στα υπόλοιπα ηπειρωτικά από 10 έως 25 βαθμούς, στα νησιά του Αιγαίου και στην Κρήτη από 12 έως 22 βαθμούς Κελσίου.

Οι άνεμοι στο Αιγαίο θα πνέουν από βόρειες διευθύνσεις μέτριοι μέχρι ισχυροί και τοπικά στα νότια σχεδόν θυελλώδεις. Στο Ιόνιο οι άνεμοι θα πνέουν από δυτικές κυρίως διευθύνσεις, σχεδόν μέτριοι.

Λίγες νεφώσεις που τις θερμές κυρίως ώρες της ημέρας θα πυκνώσουν πρόσκαιρα, περιμένουμε την Παρασκευή στην Αττική. Η θερμοκρασία θα φτάσει στους 25 βαθμούς. Οι άνεμοι θα πνέουν βόρειοι σχεδόν μέτριοι και κατά περιόδους μέτριοι.

Λίγες νεφώσεις κατά τις θερμές κυρίως ώρες της ημέρας, περιμένουμε την Παρασκευή στη Θεσσαλονίκη. Η θερμοκρασία θα φτάσει στους 23 βαθμούς. Οι άνεμοι θα πνέουν από μεταβλητές διευθύνσεις σχεδόν μέτριοι.

Σήμερα Παρασκευή



Αύριο Σάββατο



Κυριακή




www.meteo.gr
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  #1673  
Παλιά 13-05-11, 09:16
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2011 May 13

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A Beautiful Trifid

Image Credit & Copyright: R Jay Gabany
Explanation: The beautiful Trifid Nebula is a cosmic study in colorful contrasts. Also known as M20, it lies about 5,000 light-years away toward the nebula rich constellation Sagittarius. A star forming region in the plane of our galaxy, the Trifid illustrates three different types of astronomical nebulae; red emission nebulae dominated by light emitted by hydrogen atoms, blue reflection nebulae produced by dust reflecting starlight, and dark nebulae where dense dust clouds appear in silhouette. The bright red emission region, roughly separated into three parts by obscuring, dark dust lanes, lends the Trifid its popular name. In this well met scene, the red emission is also juxtaposed with the telltale blue haze of reflection nebulae. Pillars and jets sculpted by newborn stars, below and left of the emission nebula's center, appear in Hubble Space Telescope close-up images of the region. The Trifid Nebula is about 40 light-years across.

Tomorrow's picture: a little ladle

Πηγή
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  #1674  
Παλιά 14-05-11, 08:15
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Τελευταία φορά Online: 12-11-16 10:12
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2011 May 14

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The Little Dipper

Image Credit & Copyright: Rogelio Bernal Andreo
Explanation: At 2nd magnitude, Polaris is far from the brightest star in the night sky. But it is the brightest star at the left of this well-composed, starry mosaic spanning about 23 degrees across the northern sky asterism dubbed the Little Dipper. Polaris is famous as the North Pole Star, a friend to navigators and astrophotographers alike, but it's not located exactly at the North Celestial Pole (NCP) either. It's presently offset from the NCP by 0.7 degrees. Sliding your cursor over the picture will locate Polaris and the NCP as well as other stars of the Little Dipper. The stars are shown with their proper names preceded by their greek alphabet designations within the ancient constellation Ursa Minor, the Little Bear. Dust clouds suspended above the plane of our Milky Way Galaxy are also faintly visible throughout the wide field of view.


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  #1675  
Παλιά 15-05-11, 08:50
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Τελευταία φορά Online: 12-11-16 10:12
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2011 May 15

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The Sombrero Galaxy from Hubble

Credit: NASA, ESA, and the Hubble Heritage Team (STScI / AURA)
Explanation: What's going on in the center of this spiral galaxy? Named the Sombrero Galaxy for its hat-like resemblance, M104 features a prominent dust lane and a bright halo of stars and globular clusters. Reasons for the Sombrero's hat-like appearance include an unusually large and extended central bulge of stars, and dark prominent dust lanes that appear in a disk that we see nearly edge-on. Billions of old stars cause the diffuse glow of the extended central bulge. Close inspection of the bulge in the above photograph shows many points of light that are actually globular clusters. M104's spectacular dust rings harbor many younger and brighter stars, and show intricate details astronomers don't yet fully understand. The very center of the Sombrero glows across the electromagnetic spectrum, and is thought to house a large black hole. Fifty million-year-old light from the Sombrero Galaxy can be seen with a small telescope towards the constellation of Virgo.

Tomorrow's picture: cloud flow

Πηγή

Σχόλιο : Απόλυτη συμμετρία σ' αυτόν τον γαλαξία, αλλά και οι αστρονόμοι έχουν φαντασία, άκου σομπρέρο....
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  #1676  
Παλιά 16-05-11, 09:16
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Τελευταία φορά Online: 12-11-16 10:12
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2011 May 16

Credit & Copyright: Daniel López, IAC; Music: Matti Paalanen, Angel's Tear (Aeon 2)
Explanation: If you could sit back and watch clouds and the sky move all night and day, what might you see? One answer from the island of Tenerife, captured over the course of the year, includes sequences that are not only breathtaking but instructive. Visible in the above time-lapse movie include clouds that seem to flow like water, a setting sun that shows numerous green flashes, the Milky Way Galaxy rising behind towering plants, a colorful double fogbow, lenticular clouds that appear stationary near their mountain peaks, and colorful moon coronas. The above video was shot solely from the Teide National Park on Tenerife in the Canary Islands of Spain, off the north west coast of Africa. The video also features an unusual type of plant in several scenes -- can you identify it?

Tomorrow's picture: green mirror

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Τελευταία επεξεργασία από το χρήστη Xenios : 16-05-11 στις 09:20
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  #1677  
Παλιά 17-05-11, 08:18
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2011 May 17

A Starry Night of Iceland
Credit: Stephane Vetter (Nuits sacrees)
Explanation: On some nights, the sky is the best show in town. On this night, the sky was not only the best show in town, but a composite image of the sky won an international competition for landscape astrophotography. The above winning image was taken two months ago over Jökulsárlón, the largest glacial lake in Iceland. The photographer combined six exposures to capture not only two green auroral rings, but their reflections off the serene lake. Visible in the distant background sky is the band of our Milky Way Galaxy, the Pleiades open clusters of stars, and the Andromeda galaxy. A powerful coronal mass ejection from the Sun caused auroras to be seen as far south as Wisconsin, USA. As the Sun progresses toward solar maximum in the next few years, many more spectacular images of aurora are expected.

Tomorrow's picture: open space

Πηγή
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  #1678  
Παλιά 18-05-11, 07:24
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Τελευταία φορά Online: 12-11-16 10:12
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Astronomy Picture of the Day

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2011 May 18

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The Last Launch of Space Shuttle Endeavour

Credit: NASA
Explanation: Two days ago, powerful yet controlled explosions rocketed the Space Shuttle Endeavor on its final trip into Earth orbit. The above image was taken seconds after liftoff as the massive orbiter and six astronauts began a climb to a height where the atmosphere is so thin it is unbreathable. The shuttle, on mission STS-134, is expected to dock with the International Space Station (ISS) today. The Endeavour will deliver to the ISS, among other things, an ambitious detector called the Alpha Magnetic Spectrometer 2 (AMS), a detector that over the next few years could detect a significant abundance of specific types of dark matter, charged antimatter, and even a strangely possible variation of familiar matter called strangelets. The very last trip for any space shuttle is currently planned for mid-July when Atlantis will also visit the space station.

Tomorrow's picture: open space

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  #1679  
Παλιά 19-05-11, 07:49
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2011 May 19

Κάντε κλικ στην φωτογραφία για μεγάλη ανάλυση

NGC 253: Close Up
Credit: Hubble Legacy Archive, ESA, NASA; Processing and additional imaging - Robert Gendler
Explanation: This dusty island universe is one of the brightest spiral galaxies in planet Earth's sky. Seen nearly edge-on, NGC 253 is only 13 million light-years away, the largest member of the Sculptor Group of galaxies, neighbor to our own local galaxy group. The detailed close-up view is a five frame mosaic based on data assembled from Hubble Legacy Archive data. Beginning on the left near the galaxy's core, the sharp panorama follows dusty filaments, interstellar gas clouds, and even individual stars toward the galaxy's edge at the right. The magnificent vista spans nearly 50,000 light-years. The frame at the far right has been compressed slightly to bring into view an intriguing interacting pair of background galaxies. Designated a starburst galaxy because of its frantic star forming activity, NGC 253 features tendrils of dust rising from a galactic disk laced with young star clusters and star forming regions. NGC 253 is also known to be a strong source of high-energy x-rays and gamma rays, likely due to massive black holes near the galaxy's center.

Tomorrow's picture: the whole milky way

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  #1680  
Παλιά 20-05-11, 08:02
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Τελευταία φορά Online: 12-11-16 10:12
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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2011 May 20

A Journey Through the Night Sky
Image Credit & Copyright: Nick Risinger (Photopic Sky Survey)
Explanation: Majestic nebulae and stars of our Milky Way Galaxy stretch across this panoramic image of the entire night sky. At full resolution, the 5 gigapixel mosaic was stitched together from over 37,000 images, the result of a season following, year long effort and 60,000 travel miles in search of still dark skies in the American west and the western Cape of South Africa. The well-planned project combined many exposures from the dark sites, intended to produce an inspiring view of the night to rival the brightness of day. An interactive journey through the scene will uncover a congeries of innumerable stars with vast clouds of gas and dust strewn along the galactic plane and central bulge, too faint to see with the unaided eye. Even galaxies of stars beyond our Milky Way can be found within the cosmic vista.

Tomorrow's picture: dawn's early light

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