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  #1201  
Παλιά 20-02-10, 08:37
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Geostationary Highway
Credit & Copyright: Babak Tafreshi (TWAN)

Explanation: Put a satellite in a circular orbit about 42,000 kilometers from the center of the Earth (36,000 kilometers or so above the surface) and it will orbit once in 24 hours. Because that matches Earth's rotation period, it is known as a geosynchronous orbit. If that orbit is also in the plane of the equator, the satellite will hang in the sky over a fixed location in a geostationary orbit. As predicted in the 1940s by futurist Arthur C. Clark, geostationary orbits are in common use for communication and weather satellites, a scenario now well-known to astroimagers. Deep images of the night sky made with telescopes that follow the stars can also pick up geostationary satellites glinting in sunlight still shining far above the Earth's surface. Because they all move with the Earth's rotation against the background of stars, the satellites leave trails that seem to follow a highway across the celestial landscape. For example, in this wide view of the nearly equatorial Orion region, individual frames were added to create a 10 minute long exposure. It shows Orion's belt stars and well-known nebulae along with many 2.5 degree long geostationary satellite trails. The frames are from an ingenious movie, featuring the geostationary satellite highway.

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  #1202  
Παλιά 21-02-10, 09:16
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NGC 2440: Cocoon of a New White Dwarf
Credit: H. Bond (STScI), R. Ciardullo (PSU), WFPC2, HST, NASA

Explanation: Like a butterfly, a white dwarf star begins its life by casting off a cocoon that enclosed its former self. In this analogy, however, the Sun would be a caterpillar and the ejected shell of gas would become the prettiest of all! In the above cocoon, the planetary nebula designated NGC 2440, contains one of the hottest white dwarf stars known. The white dwarf can be seen as the bright dot near the photo's center. Our Sun will eventually become a white dwarf butterfly but not for another 5 billion years. The above false color image was post-processed by Forrest Hamilton.

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  #1203  
Παλιά 22-02-10, 08:21
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Galaxy Group Hickson 31
Credit: NASA, ESA, J. English (U. Manitoba), and the Hubble Heritage Team (STScI/AURA);
Acknowledgement: S. Gallagher (U. Western Ontario)

Explanation: Will the result of these galactic collisions be one big elliptical galaxy? Quite possibly, but not for another billion years. Pictured above, several of the dwarf galaxies of in the Hickson Compact Group 31 are seen slowly merging. Two of the brighter galaxies are colliding on the far left, while an elongated galaxy above is connected to them by an unusual bridge of stars. Inspection of the above image further indicates that the bright duo trail a rope of stars pointing to the spiral galaxy on the far right. Most assuredly, the pictured galaxies of Hickson Compact Group 31 will pass through and destroy each other, millions of stars will form and explode, and thousands of nebula will form and dissipate before the dust settles and the final galaxy emerges about one billion years from now. The above image is a composite of images taken in infrared light by the Spitzer Space Telescope, ultraviolet light by the GALEX space telescope, and visible light by the Hubble Space Telescope. Hickson Compact Group 31 spans about 150 thousand light years and lies about 150 million light years away toward the constellation of Eridanus.

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  #1204  
Παλιά 23-02-10, 08:15
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Exceptional Rocket Waves Destroy Sun Dog
Credit & Copyright: George C. Privon (U. Virginia)

Explanation: What created those rocket waves, and why did they destroy that sun dog? Close inspection of the above image shows not only a rocket rising near the center, but unusual air ripples around it and a colorful sundog to the far right. The rocket, carrying the Solar Dynamics Observatory (SDO), lifted off two weeks ago from Cape Canaveral, Florida, USA into a cold blue sky. The SDO is designed to observe the Sun continuously over the next several years, exploring the Sun's atmosphere at high resolution and fast time scales. The air ripples -- seen about one minute after launch -- were unexpected, as was the sudden disappearance of the sundog after the ripples passed. Noticed and recorded by several onlookers, there has been much speculation about the origin of the ripples. An ongoing discussion about them can be joined here in APOD's discussion board the Asterisk. A leading hypothesis holds that the ripples resulted from a sonic boom created as the rocket broke the sound barrier, which then jumbled a thin layer of ice crystals that were aligned to create the sundog. Lingering questions include why other rocket launches don't produce air ripples as noticeable, and why the ripples appeared more prominent above the rocket. If you know of images of any other aircraft or spacecraft that have produced similar air ripples, please post them to the discussion thread -- they may be help create a better understanding of the effect.

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Σχόλιο : Δεν έχω ξαναδεί κάτι παρόμοιο !!! Είναι αποτέλεσμα της διάσπασης του ήχουμ της ψυχρής ατμόσφαιρας και της θέσης του ήλιου...
Εδώ μπορείτε να διαβάσετε περισσότερα για το συγκεκριμένο.
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  #1205  
Παλιά 24-02-10, 08:20
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Astronaut Installs Panoramic Space Window
Credit: ISS Expedition 22 Crew, Shuttle Endeavour STS-130 Crew, NASA

Explanation: This space job was almost complete. Floating just below the International Space Station, astronaut Nicholas Patrick put some finishing touches on the newly installed cupola space windows last week. Patrick was a mission specialist onboard the recently completed space shuttle Endeavor's STS-130 mission to the ISS. Pictured, Patrick floats near the outermost of seven windows on the new cupola of the just-installed Tranquility module. Patrick hovers about 340 kilometers over the Earth's surface, well in front of the blue sky, blue water, and white clouds pictured far in the background. In the above image, covers on windows three and four were in place and clearly labelled. Images from inside the ISS's new panoramic cupola are now available.

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Σχόλιο : Η φωτογραφία
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Οι παρακάτω χρήστες έχουν πει 'Ευχαριστώ' στον/στην Xenios για αυτό το μήνυμα:
christi (24-02-10)
  #1206  
Παλιά 24-02-10, 10:37
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Τελευταία φορά Online: Χθες 19:41
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Αρχική Δημοσίευση από Xenios Εμφάνιση μηνυμάτων
Σχόλιο : Η φωτογραφία
Διαφωνώ! ο ορίζοντας είναι στραβός!
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An eye for an eye, will make us all blind... Mahatma Ghandi
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  #1207  
Παλιά 24-02-10, 11:19
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Διαφωνώ! ο ορίζοντας είναι στραβός!
Ξέρεις ... η γη είναι στρογγυλή και το χειρότερο γυρίζει, παρά τα όσα, περί του αντιθέτου, λέγονται

(Δεν τη γλυτώνω την πυρά..)
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  #1208  
Παλιά 25-02-10, 08:26
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Edge-on Spiral Galaxy NGC 891
Credit & Copyright: Bob Franke

Explanation: This beautiful cosmic portrait features NGC 891. The spiral galaxy spans about 100 thousand light-years and is seen almost exactly edge-on from our perspective. In fact, about 30 million light-years distant in the constellation Andromeda, NGC 891 looks a lot like our Milky Way. At first glance, it has a flat, thin, galactic disk and a central bulge cut along the middle by regions of dark obscuring dust. Also apparent in NGC 891's ege-on presentation are filaments of dust that extend hundreds of light-years above and below the center line. The dust has likely been blown out of the disk by supernova explosions or intense star formation activity. Faint neighboring galaxies can also been seen near this galaxy's disk.

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  #1209  
Παλιά 26-02-10, 08:11
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Chasing Carina
Credit & Copyright: Dieter Willasch

Explanation: A jewel of the southern sky, the Great Carina Nebula, aka NGC 3372, spans over 300 light-years. Near the upper right of this expansive skycape, it is much larger than the more northerly Orion Nebula. In fact, the Carina Nebula is one of our galaxy's largest star-forming regions and home to young, extremely massive stars, including the still enigmatic variable Eta Carinae, a star with well over 100 times the mass of the Sun. Nebulae near the center of the 10 degree wide field include NGC 3576 and NGC 3603. Near center at the top of the frame is open star cluster NGC 3532, the Wishing Well Cluster. More compact, NGC 3766, the Pearl Cluster, can be spotted at the left. Anchoring the lower left of the cosmic canvas is another large star-forming region, IC 2948 with embedded star cluster IC 2944. That region is popularly known as the Running Chicken Nebula.

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Σχόλιο : Μην χάσετε την αυριανή φωτογραφία
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  #1210  
Παλιά 27-02-10, 09:14
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Dawn's Endeavour
Credit & Copyright: Malcolm Park

Explanation: On February 21st, the Space Shuttle Endeavour and the International Space Station (ISS) flew through the sky near dawn over Whitby, Ontario, Canada. Along with star trails, both were captured in this single time exposure. Glinting in sunlight 350 kilometers above the Earth, Endeavour slightly preceeded the ISS arcing over the horizon. But the brighter trail and the brighter flare belongs to the space station just visted by Endeavour. Near the completion of the STS-130 mission, hours later Endeavour made a night landing at Kennedy Space Center.

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  #1211  
Παλιά 28-02-10, 08:42
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Pauli Exclusion Principle: Why You Don't Implode
Credit & Copyright: Andrew Truscott & Randall Hulet (Rice U.)

Explanation: Why doesn't matter just bunch up? The same principle that keeps neutron stars and white dwarf stars from imploding also keeps people from imploding and makes normal matter mostly empty space. The observed reason is known as the Pauli Exclusion Principle. The principle states that identical fermions -- one type of fundamental matter -- cannot be in the same place at the same time and with the same orientation. The other type of matter, bosons, do not have this property, as demonstrated clearly by recently created Bose-Einstein condensates. Earlier this decade, the Pauli Exclusion Principle was demonstrated graphically in the above picture of clouds of two isotopes of lithium -- the left cloud composed of bosons while the right cloud is composed of fermions. As temperature drops, the bosons bunch together, while the fermions better keep their distance. The reason why the Pauli Exclusion Principle is true and the physical limits of the principle are still unknown.

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  #1212  
Παλιά 01-03-10, 08:34
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Slope Streaks in Acheron Fossae on Mars
Credit: HiRISE, MRO, LPL (U. Arizona), NASA

Explanation: What creates these picturesque dark streaks on Mars? No one knows for sure. A leading hypothesis is that streaks like these are caused by fine grained sand sliding down the banks of troughs and craters. Pictured above, dark sand appears to have flowed hundreds of meters down the slopes of Acheron Fossae. The sand appears to flow like a liquid around boulders, and, for some reason, lightens significantly over time. This sand flow process is one of several which can rapidly change the surface of Mars, with other processes including dust devils, dust storms, and the freezing and melting of areas of ice. The above image was taken by the HiRise camera on board the Mars Reconnaissance Orbiter which has been orbiting Mars since 2006. Acheron Fossae is a 700 kilometer long trough in the Diacria quadrangle of Mars.

Πηγή

Σχόλιο : Να μια ακόμα περιγραφή αμφιλεγόμενη, που δεν συνήθιζε παλιά η NASA. Ο αφελής εγώ, πιστεύω ότι είναι στα πλαίσια πιέσεων, για την άρση της περικοπής κονδυλίων από τον Ομπάμα.... Δεν αποκλείεται προσεχώς, να μας δείξει και κανένα μπλε ... ανθρωπάκι
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  #1213  
Παλιά 02-03-10, 09:05
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M78 and Reflecting Dust Clouds in Orion
Credit & Copyright: Ignacio de la Cueva Torregrosa

Explanation: An eerie blue glow and ominous columns of dark dust highlight M78 and other bright reflection nebula in the constellation of Orion. The dark filamentary dust not only absorbs light, but also reflects the light of several bright blue stars that formed recently in the nebula. Of the two reflection nebulas pictured above, the more famous nebula is M78, in the image center, while NGC 2071 can be seen to its lower left. The same type of scattering that colors the daytime sky further enhances the blue color. M78 is about five light-years across and visible through a small telescope. M78 appears above only as it was 1600 years ago, however, because that is how long it takes light to go from there to here. M78 belongs to the larger Orion Molecular Cloud Complex that contains the Great Nebula in Orion and the Horsehead Nebula.

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  #1214  
Παλιά 03-03-10, 07:51
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The International Space Station from Above
Credit: STS-130 Crew, NASA

Explanation: The International Space Station (ISS) is the largest human-made object ever to orbit the Earth. The ISS is so large that it can be seen drifting overhead with the unaided eye, and is frequently imaged from the ground in picturesque fashion. Last month, the station was visited again by space shuttle, which resupplied the station and added a new module. The ISS is currently operated by the Expedition 22 crew, now consisting five astronauts including two supplied by USA's NASA, two by Russia's RKA, and one by Japan's JAXA. After departing the ISS, the crew of the space shuttle Endeavour captured the above spectacular vista of the orbiting space city high above the clouds, waters, and lands of Earth. Visible components include modules, trusses, and expansive solar arrays that gather sunlight that is turned into needed electricity.

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  #1215  
Παλιά 04-03-10, 08:12
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NGC 4565: Galaxy on Edge
Image Credit & Copyright: Acquisition - Torsten Grossmann, Processing - Dietmar Hager

Explanation: Magnificent spiral galaxy NGC 4565 is viewed edge-on from planet Earth. Also known as the Needle Galaxy for its narrow profile, bright NGC 4565 is a stop on many telescopic tours of the northern sky, in the faint but well-groomed constellation Coma Berenices. This sharp, colorful image reveals the galaxy's bulging central core cut by obscuring dust lanes that lace NGC 4565's thin galactic plane. An assortment of other galaxies are included in the pretty field of view. Neighboring galaxy NGC 4562 is at the upper right. NGC 4565 itself lies about 40 million light-years distant, spanning some 100,000 light-years. Easily spotted with small telescopes, sky enthusiasts consider NGC 4565 to be a prominent celestial masterpiece Messier missed.

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