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Εργαλεία Θεμάτων Τρόποι εμφάνισης
  #1651  
Παλιά 21-04-11, 08:25
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας

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Peculiar Galaxies of Arp 273
Credit: NASA, ESA, and the Hubble Heritage Team (STScI / AURA)

Explanation: The spiky stars in the foreground of this sharp cosmic portrait are well within our own Milky Way Galaxy. The two eye-catching galaxies lie far beyond the Milky Way, at a distance of over 300 million light-years. Their distorted appearance is due to gravitational tides as the pair engage in close encounters. Cataloged as Arp 273 (also as UGC 1810), the galaxies do look peculiar, but interacting galaxies are now understood to be common in the universe. In fact, the nearby large spiral Andromeda Galaxy is known to be some 2 million light-years away and approaching the Milky Way. Arp 273 may offer an analog of their far future encounter. Repeated galaxy encounters on a cosmic timescale can ultimately result in a merger into a single galaxy of stars. From our perspective, the bright cores of the Arp 273 galaxies are separated by only a little over 100,000 light-years. The release of this stunning vista celebrates the 21st anniversary of the Hubble Space Telescope in orbit.

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  #1652  
Παλιά 22-04-11, 09:10
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Τελευταία φορά Online: 12-11-16 11:12
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Virgo Cluster Galaxies
Image Credit & Copyright: Rogelio Bernal Andreo

Explanation: Well over a thousand galaxies are known members of the Virgo Cluster, the closest large cluster of galaxies to our own local group. In fact, the galaxy cluster is difficult to appreciate all at once because it covers such a large area on the sky. Spanning about 5x3 degrees, this careful mosaic of telescopic images clearly records the central region of the Virgo Cluster through faint foreground dust clouds lingering above the plane of our own Milky Way galaxy. The cluster's dominant giant elliptical galaxy M87, is just below center in the frame. Above M87 is the famous interacting galaxy pair NGC 4438, also known as The Eyes. A closer examination of the image will reveal many Virgo cluster member galaxies as small fuzzy patches. Sliding your cursor over the image will label the larger galaxies using NGC catalog designations. Galaxies are also shown with Messier catalog numbers, including M84, M86, and prominent colorful spirals M88, M90, and M91. On average, Virgo Cluster galaxies are measured to be about 48 million light-years away. The Virgo Cluster distance has been used to give an important determination of the Hubble Constant and the scale of the Universe. (Editor's Note: Labels courtesy of Astrometry.net.)

Πηγή

Σχόλιο : Δείτε την εικόνα σε μεγάλο μέγεθος, είναι απίστευτο αυτό το «δάσος» γαλαξιών.
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  #1653  
Παλιά 24-04-11, 08:33
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Τελευταία φορά Online: 12-11-16 11:12
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The Cat's Eye Nebula from Hubble
Credit: NASA, ESA, HEIC, and The Hubble Heritage Team (STScI/AURA)

Explanation: Staring across interstellar space, the alluring Cat's Eye nebula lies three thousand light-years from Earth. A classic planetary nebula, the Cat's Eye (NGC 6543) represents a final, brief yet glorious phase in the life of a sun-like star. This nebula's dying central star may have produced the simple, outer pattern of dusty concentric shells by shrugging off outer layers in a series of regular convulsions. But the formation of the beautiful, more complex inner structures is not well understood. Seen so clearly in this sharp Hubble Space Telescope image, the truly cosmic eye is over half a light-year across. Of course, gazing into the Cat's Eye, astronomers may well be seeing the fate of our sun, destined to enter its own planetary nebula phase of evolution ... in about 5 billion years.

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  #1654  
Παλιά 24-04-11, 09:48
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High Elf
 

Τελευταία φορά Online: 08-05-17 14:17
Φύλο: Δεν έχω αποφασίσει ακόμα
Η διαθεσή μου τώρα:
μπουμ :Ρ
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Υπάρχουν σε όλα δύο απόψεις...
Αυτή που λέω εγώ, και η σωστή!
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  #1655  
Παλιά 25-04-11, 08:56
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Τελευταία φορά Online: 12-11-16 11:12
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Monsters of IC 1396
Credit & Copyright: Geert Barentsen & Jorick Vink (Armagh Observatory) & the IPHAS Collaboration
Explanation: Is there a monster in IC 1396? Known to some as the Elephant's Trunk Nebula, parts of the glowing gas and dust clouds of this star formation region may appear to take on foreboding forms, some nearly human. The entire nebula might even look like a face of a monster. The only real monster here, however, is a bright young star too far from Earth to be dangerous. Energetic light from this star is eating away the dust of the dark cometary globule at the top right the image. Jets and winds of particles emitted from this star are also pushing away ambient gas and dust. Nearly 3,000 light-years distant, the IC 1396 complex is relatively faint and covers a region on the sky with an apparent width of more than 10 full moons. Recently, over 100 young stars have been discovered forming in the nebula.

Πηγή

Σχόλιο : Εδώ τι θα σχολιάσεις Μιχάλη;
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  #1656  
Παλιά 26-04-11, 08:56
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας
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 April 26


Κάντε κλικ στην φωτογραφία για μεγάλη ανάλυση

Hydrogen in the LMC
Credit & Copyright: Marco Lorenzi (Star Echoes)
Explanation: A satellite galaxy of our own Milky Way, the Large Magellanic Cloud (LMC) is an alluring sight in dark southern skies and the constellation Dorado. A mere 180,000 light-years distant, the LMC is seen in amazing detail in this very deep 4 frame mosaic of telescopic images, a view that reveals the Milky Way's satellite to have the appearance of a fledgling barred spiral galaxy. The mosaic includes image data taken through a narrow filter that transmits only the red light of hydrogen atoms. Ionized by energetic starlight, a hydrogen atom emits the characteristic red H-alpha light as its single electron is recaptured and transitions to lower energy states. As a result, this mosaic seems spattered with pinkish clouds of hydrogen gas surrounding massive, young stars. Sculpted by the strong stellar winds and ultraviolet radiation, the glowing hydrogen clouds are known as H II (ionized hydrogen) regions. Composed of many overlapping clouds, the sprawling Tarantula Nebula left of center, is by far the LMC's largest star forming region. The Large Magellanic Cloud is about 15,000 light-years across.

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  #1657  
Παλιά 27-04-11, 08:15
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Τελευταία φορά Online: 12-11-16 11:12
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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 April 27

Κάντε κλικ στην φωτογραφία για μεγάλη ανάλυση

The Dark Tower in Scorpius
Credit & Copyright: Don Goldman
Explanation: In silhouette against a crowded star field toward the constellation Scorpius, this dusty cosmic cloud evokes for some the image of an ominous dark tower. In fact, clumps of dust and molecular gas collapsing to form stars may well lurk within the dark nebula, a structure that spans almost 40 light-years across this gorgeous telescopic portrait. Known as a cometary globule, the swept-back cloud, extending from the lower right to the head (top of the tower) left and above center, is shaped by intense ultraviolet radiation from the OB association of very hot stars in NGC 6231, off the upper edge of the scene. That energetic ultraviolet light also powers the globule's bordering reddish glow of hydrogen gas. Hot stars embedded in the dust can be seen as bluish reflection nebulae. This dark tower, NGC 6231, and associated nebulae are about 5,000 light-years away.

Πηγή
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  #1658  
Παλιά 28-04-11, 08:41
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Τελευταία φορά Online: 12-11-16 11:12
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Astronomy Picture of the Day

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2011 April 28

Κάντε κλικ στην φωτογραφία για μεγάλη ανάλυση


Scintillating

Image Credit & Copyright: Juergen Michelberger

Explanation: On June 4, 2010 Regulus, alpha star of the constellation Leo, and wandering planet Mars were at about the same apparent brightness, separated on the sky by 1.5 degrees. An ingenious and creative 10 second exposure from a swinging camera recorded these gyrating trails of the celestial pairing. Can you tell which trail belongs to the star and which to the planet? Hint: atmospheric turbulence causes the image of the star to scintillate or vary in brightness and color more readily than the planet. The scintillation is more pronounced because the star is effectively a point source of light seen as a narrow bundle of light rays. Rapidly changing refraction due to turbulence along the line of sight affects different colors of light by different amounts and generally produces a twinkling effect for stars. But Mars is much closer than the distant stars and an extended source of light. Though tiny, its disk is seen as a bundle of light rays that is substantially broader compared to a star's and so, on average, less affected by small scale turbulence. The result is the varied, rainbow like trail for Regulus (left) and the steadier, consistently reddish trail for Mars.


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  #1659  
Παλιά 29-04-11, 07:38
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας
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 April 29

Κάντε κλικ στην φωτογραφία για μεγάλη ανάλυση

The Antennae

Image Credit & Copyright: Acquisition and data reduction - Andrey Oreshko (Elena Remote Observatory),
Processing - Dietmar Hager (stargazer-observatory)

Explanation: Some 60 million light-years away in the southerly constellation Corvus, two large galaxies collided. But the stars in the two galaxies, cataloged as NGC 4038 and NGC 4039, don't collide in the course of the ponderous event, lasting hundreds of millions of years. Instead, their large clouds of molecular gas and dust do, triggering furious episodes of star formation near the center of the cosmic wreckage. Spanning about 500 thousand light-years, this stunning view also reveals new star clusters and matter flung far from the scene of the accident by gravitational tidal forces. Of course, the suggestive visual appearance of the extended arcing structures gives the galaxy pair its popular name - The Antennae.

Tomorrow's picture: in the darkness of the night
Πηγή


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  #1660  
Παλιά 30-04-11, 08:28
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας
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 April 30

Κάντε κλικ στην φωτογραφία για μεγάλη ανάλυση

Tycho's Supernova Remnant

X-Ray Image Credit: NASA / CXC / F.J. Lu (Chinese Academy of Sciences) et al.
Poem: Alice Allen (apologies to William Blake)

Explanation:
Tycho! Tycho! burning bright
In the darkness of the night,
What exploding white dwarf star
Did frame thy remnant from afar,

In the distant deep dark skies
Under gaze of human eyes?
Seen by mortals and their ma
Named for one called Tycho Brahe.


Tomorrow's picture: Sunday's Childe

__________________
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  #1661  
Παλιά 01-05-11, 08:35
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Τελευταία φορά Online: 12-11-16 11:12
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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 1

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Molecular Cloud Barnard 163

Credit & Copyright: T. Rector (U. Alaska Anchorage), H. Schweiker, WIYN, NOAO, AURA, NSF
Explanation: It may look to some like a duck, but it lays stars instead of eggs. In the center of the above image lies Barnard 163, a nebula of molecular gas and dust so thick that visible light can't shine through it. With a wing span measured in light years, Barnard 163's insides are surely colder than its exterior, allowing conditions where gas can clump and eventually form stars. Barnard 163 lies about 3,000 light years from Earth toward the constellation of Cepheus the King. The red glow in the background results from IC 1396, a large emission nebula that houses the Elephant's Trunk Nebula. Finding Barnard 163 in an image of its greater emission nebula IC 1396 can be a challenge, but it's possible.

Tomorrow's picture: old spot

Πηγή
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  #1662  
Παλιά 02-05-11, 08:09
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας
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 2

Κάντε κλικ στην φωτογραφία για μεγάλη ανάλυση

Jupiter's Great Red Spot from Voyager 1

Credit: NASA, JPL; Digital processing: Björn Jónsson (IAAA)

Explanation: It is a hurricane twice the size of the Earth. It has been raging at least as long as telescopes could see it, and shows no signs of slowing. It is Jupiter's Great Red Spot, the largest swirling storm system in the Solar System. Like most astronomical phenomena, the Great Red Spot was neither predicted nor immediately understood after its discovery. Still today, details of how and why the Great Red Spot changes its shape, size, and color remain mysterious. A better understanding of the weather on Jupiter may help contribute to the better understanding of weather here on Earth. The above image is a recently completed digital enhancement of an image of Jupiter taken in 1979 by the Voyager 1 spacecraft as it zoomed by the Solar System's largest planet. At about 117 AU from Earth, Voyager 1 is currently the most distant human made object in the universe and expected to leave the entire solar heliosheath any time now.

Tomorrow's picture: open space

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  #1663  
Παλιά 03-05-11, 08:25
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Τελευταία φορά Online: 12-11-16 11:12
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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 3

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Globular Cluster M15 from Hubble

Credit: ESA, Hubble, NASA

Explanation: Stars, like bees, swarm around the center of bright globular cluster M15. This ball of over 100,000 stars is a relic from the early years of our Galaxy, and continues to orbit the Milky Way's center. M15, one of about 150 globular clusters remaining, is noted for being easily visible with only binoculars, having at its center one of the densest concentrations of stars known, and containing a high abundance of variable stars and pulsars. This sharp image, taken by the Earth-orbiting Hubble Space Telescope, spans about 120 light years. It shows the dramatic increase in density of stars toward the cluster's center. M15 lies about 35,000 light years away toward the constellation of the Winged Horse (Pegasus). Recent evidence indicates that a massive black hole might reside as the center of M15.

Tomorrow's picture: pixels in space

Πηγή
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  #1664  
Παλιά 04-05-11, 08:11
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας
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 4


Celestial Trails over Greece
Credit & Copyright: Chris Kotsiopoulos (GreekSky); Music: Undisclosed Desires (Muse), WMG

Explanation: If you watch the horizon at just the right place and at just the right time, you can witness some spectacular juxtapositions between Earth and sky. In the above video, stars, the Moon, and even a partially eclipsed Sun were recorded rising and setting over photogenic landmarks in Greece. The inspiring video features effects on star trials that are pretty but somewhat deceiving, as stars will typically remain at nearly the same brightness as the Earth turns beneath them. Also, the time lapse nature of part of the video causes clouds to appear to jump about and fade in an unfamiliar fashion. Several stills of these scenes have appeared on APOD previously, including the partial solar eclipse over the Temple of Poseidon, cloud and star trails over a deserted church, and star trails over an old ship. Other foreground venues include an old church in Peloponnese, a stone bridge in Ioannina, a Frankish Castle in Euboea, and a picturesque sunset above Lycabettus Hill, Athens.

Πηγή

Σχόλιο : Μια σπάνια δωρεάν διαφήμιση της Ελλάδος, με πολλά εκατομμύρια θεατές.
__________________
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  #1665  
Παλιά 05-05-11, 07:56
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Τελευταία φορά Online: 12-11-16 11:12
Φύλο: Άντρας
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 5

Κάντε κλικ στην φωτογραφία για μεγάλη ανάλυση

50 Years Ago: Freedom 7 Flies

Credit: NASA
Explanation: Fifty years ago, near the dawn of the space age, NASA controllers "lit the candle" and sent Mercury astronaut Alan Shepard arcing into space atop a Redstone rocket. His cramped space capsule was dubbed Freedom 7. Broadcast live to a global television audience, the historic Mercury-Redstone 3 (MR-3) spacecraft was launched from Cape Canaveral Florida at 9:34 a.m. Eastern Time on May 5, 1961. The flight of Freedom 7 - the first space flight by an American - followed less than a month after the first human venture into space by Soviet Cosmonaut Yuri Gagarin. The 15 minute sub-orbital flight achieved an altitude of 116 miles and a maximum speed of 5,134 miles per hour. As Shepard looked back toward planet Earth near the peak of Freedom 7's trajectory, he could see the outlines of the west coast of Florida, Lake Okeechobe in central Florida, the Gulf of Mexico, and the Bahamas.
Tomorrow's picture: farther along

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