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    Index du Forum » » L'actualité scientifique peu connue » » Collection des plus belles images de l'Univers  
    12 pages [ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 ]
    AuteurCollection des plus belles images de l'Univers
    Alain
    10426       

    Alain
      Posté : 10-09-2004 19:11



    Cat's Eye
    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.

    ------------



    Molecular Torus Surrounds Black Hole
    Illustration Credit: V. Beckmann (NASA's GSFC) et al., ESA
    Explanation: Why do some black hole surroundings appear brighter than others? In the centers of active galaxies, supermassive black holes at least thousands of times the mass of our Sun dominate. Many, called Seyfert Type I, are very bright in visible light. Others, called Seyfert Type II, are rather dim. The difference might be caused by some black holes accreting much more matter than others. Alternatively, the black holes in the center of Seyfert Type II galaxies might be obscured by a surrounding torus. To help choose between these competing hypotheses, the nearby Seyfert II galaxy NGC 4388 has been observed in X-ray light recently by many recent Earth-orbiting X-ray observatories, including CGRO, SIGMA, BeppoSAX, INTEGRAL, Chandra, and XMM-Newton. Recent data from INTEGRAL and XMM-Newton have found that the X-ray flux in some X-ray colors varies rapidly, while flux in other X-ray colors is quite steady. The constant flux and apparent absorption of very specific X-ray colors by cool iron together give evidence that the central black hole in NGC 4388 is seen through a thick torus composed of molecular gas and dust.

    ------



    M51: The Whirlpool Galaxy in Dust and Stars
    Credit: Credit: N. Scoville (Caltech), T. Rector (U. Alaska, NOAO) et al., Hubble Heritage Team, NASA
    Explanation: The Whirlpool Galaxy is a classic spiral galaxy. At only 30 million light years distant and fully 60 thousand light years across, M51, also known as NGC 5194, is one of the brightest and most picturesque galaxies on the sky. The above image is a digital combination of a ground-based image from the 0.9-meter telescope at Kitt Peak National Observatory and a space-based image from the Hubble Space Telescope highlighting sharp features normally too red to be seen. Anyone with a good pair of binoculars, however, can see this Whirlpool toward the constellation of Canes Venatici. M51 is a spiral galaxy of type Sc and is the dominant member of a whole group of galaxies. Astronomers speculate that M51's spiral structure is primarily due to its gravitational interaction with a smaller galaxy just off the top of this digitally sharpened image.

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    Je mettrais à jour à chaque fois que cela en vaudra la peine

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    [ Message édité par : Alain : 10-09-2004 19:17 ]

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    Edith
    140     

    Edith
      Posté : 15-09-2004 18:17

    MERCI POUR CES MAGNIFIQUES PHOTOS.



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    M51
    189     

    M51
      Posté : 16-09-2004 12:08

    Merci pour ces superbes photos, j'apprécie tout particulièrement celle concernant M51.
    De cet univers île transparait l'infinité du réél, la pluralité des mondes. Combien d'étoiles, combien de planètes autour et combien de vies? Multiplicité des mondes. A quoi ressemble notre galaxie vue de loin? L'expression de la vie est infinie et nous ne savons pas regarder. Ne brisons pas la symétrie.



    La vie est plus importante que l'argent.

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    Francoise
    10272       

    Francoise
      Posté : 16-09-2004 15:36

    Oui Alain, des photos comme ça tu peux nous en mettre tant que tu veux i
    Elles sont superbes et aident à relativiser...

    J'en faisait déjà collection à 14 ans !

    Et pour ceux à qui cela aurait échappé, ce merveilleux clip transmis il y a quelques mois par Jade:
    Go >> http://wires.news.com.au/special/mm/030811-hubble.htm



    -> http://www.sens-de-la-vie.com
    Heureusement, Wakan Tanka a prévu l' impermanence !!!

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    Alain
    10426       

    Alain
      Posté : 27-09-2004 16:01

    Content que cela vous ait plu. La suite



    The Great Nebula in Orion

    Credit & Copyright: Stefan Seip

    Explanation: The Great Nebula in Orion is a colorful place. Visible to the unaided eye, it appears as a small fuzzy patch in the constellation of Orion. Long exposure, digitally sharpened images like this, however, show the Orion Nebula to be a busy neighborhood of young stars, hot gas, and dark dust. The power behind much of the Orion Nebula (M42) is the Trapezium - four of the brightest stars in the nebula. Many of the filamentary structures visible are actually shock waves - fronts where fast moving material encounters slow moving gas. The Orion Nebula spans about 40 light years and is located about 1500 light years away in the same spiral arm of our Galaxy as the Sun.



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    M51
    189     

    M51
      Posté : 28-09-2004 02:27

    Est ce le fait du hasard mais j'ai l'impression d'apercevoir d'ignobles dragons dans cette image. C'est certainement un mauvais tour de mon imagination si profane.


    La vie est plus importante que l'argent.

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    Alain
    10426       

    Alain
      Posté : 07-10-2004 18:14

    On continue



    Moon Lightning

    Credit & Copyright: Marc-André Besel

    Explanation: Moonsets are not often quite as exciting as this one. But amateur astronomer Marc-Andre Besel was impressed by the brilliant lighting displays that joined the first quarter Moon and stars of the constellation Scorpius in western skies. On August 22, 2004, his view looked across the Gulf of Mexico from Anna Maria Island, Florida, USA, a region that would experience even more stormy weather in the coming days. The alluring digital image is a time exposure, by chance capturing the details of a brief flash of lightning along with an overexposed Moon and dramatic cloud formations. In fact, the exposure is long enough to show the background stars as short streaks or trails. The bright yellowish star trail, just above and right of the lightning flash, is red giant star Antares.



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    Alain
    10426       

    Alain
      Posté : 17-10-2004 18:00

    Et encore une



    IC 418: The Spirograph Nebula

    Credit: R. Sahai (JPL) et al., Hubble Heritage Team (STScI/AURA), NASA

    Explanation: What is creating the strange texture of IC 418? Dubbed the Spirograph Nebula for its resemblance to drawings from a cyclical drawing tool, planetary nebula IC 418 shows patterns that are not well understood. Perhaps they are related to chaotic winds from the variable central star, which changes brightness unpredictably in just a few hours. By contrast, evidence indicates that only a few million years ago, IC 418 was probably a well-understood star similar to our Sun. Only a few thousand years ago, IC 418 was probably a common red giant star. Since running out of nuclear fuel, though, the outer envelope has begun expanding outward leaving a hot remnant core destined to become a white-dwarf star, visible in the image center. The light from the central core excites surrounding atoms in the nebula causing them to glow. IC 418 lies about 2000 light-years away and spans 0.3 light-years across. This false-color image taken from the Hubble Space Telescope reveals the unusual details.


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    Francoise
    10272       

    Francoise
      Posté : 26-10-2004 21:28

    Calendrier Cosmique 2005
    Go >> http://www.deviantart.com/view/10948435

    Offert par hl.


    -> http://www.sens-de-la-vie.com
    Heureusement, Wakan Tanka a prévu l' impermanence !!!

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    Alain
    10426       

    Alain
      Posté : 04-11-2004 11:41

    La nébuleuse de l'Iris: une fleur aux couleurs délicate



    NGC 7023: The Iris Nebula

    Image Credit & Copyright: Jim Misti (acquisition), Robert Gendler (processing)

    Explanation: "Like delicate cosmic petals, these clouds of interstellar dust and gas have blossomed 1,300 light-years away in the fertile star fields of the constellation Cepheus. Sometimes called the Iris Nebula and dutifully cataloged as NGC 7023, this is not the only nebula in the sky to evoke the imagery of flowers. Still, the beautiful digital image shows off the Iris Nebula's range of colors and symmetries in impressive detail. Within the Iris, dusty nebular material surrounds a massive, hot, young star in its formative years. Central filaments of cosmic dust glow with a reddish photoluminesence as some dust grains effectively convert the star's invisible ultraviolet radiation to visible red light. Yet the dominant color of the nebula is blue, characteristic of dust grains reflecting starlight. Dark, obscuring clouds of dust and cold molecular gas are also present and can lead the eye to see other convoluted and fantastic shapes. Infrared observations indicate that this nebula may contain complex carbon molecules known as PAHs. As shown here, the Iris Nebula is about 6 light-years across. "



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    [ Message édité par : Moderateur : 07-11-2004 03:00 ]

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    santiphap
    579      

    santiphap
      Posté : 07-11-2004 17:28

    Merci de ces photos fabuleuses Cher Alain!
    C'est absolument incroyable , original et 100% authentique .
    Et ca fait partie de la realite du cosmos!

    L attention , c'est la Conscience.Jean Godet .Tat Twam Assi:Tu es Cela ,toi .Oser et vaincre!La R-evolution humaniste ,ecologiste et spirituelle ,c'est TOI maintenant qui l'aide !Light Life Love pour nous tous!

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    Alain
    10426       

    Alain
      Posté : 13-11-2004 18:05

    Le coeur de notre Galaxie vue en rayons X



    X-Rays from the Galactic Core

    Credit: Fred Baganoff (MIT), Mark Morris (UCLA), et al., CXC, NASA

    Explanation: Using the orbiting Chandra X-ray Observatory, astronomers have taken this long look at the core of our Milky Way galaxy, some 26,000 light-years away. The spectacular false-color view spans about 130 light-years. It reveals an energetic region rich in x-ray sources and high-lighted by the central source, Sagittarius A*, known to be a supermassive black hole with 3 million times the mass of the Sun. Given its tremendous mass, Sagittarius A* is amazingly faint in x-rays in comparison to central black holes observed in distant galaxies, even during its frequent x-ray flares. This suggests that this supermassive black hole has been starved by a lack of infalling material. In fact, the sharp Chandra image shows clouds of multi-million degree gas dozens of light-years across flanking (upper right and lower left) the central region -- evidence that violent events have cleared much material from the vicinity of the black hole.



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    Francoise
    10272       

    Francoise
      Posté : 13-11-2004 18:30

    Merci Alain !
    Veux tu bien , à l'occasion, mettre ici la galaxie du Cygne ?

    -> http://www.sens-de-la-vie.com
    Heureusement, Wakan Tanka a prévu l' impermanence !!!

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    Alain
    10426       

    Alain
      Posté : 16-11-2004 13:38

    Tes désirs sont des ordres, ici est une PARTIE de la constellation du Cygne



    Il s'agit d'une nébuleuse où je suis allé (notamment) le 18 novembre 2001.

    Voici l'explication scientifique

    Nebula Nova Cygni Turns On

    Credit: Peter Garnavich (Notre Dame), 1.2-m Telescope, Whipple Observatory

    Explanation: "Old photographs show no evidence of the above nebula. In 1992, a white dwarf star toward the constellation of Cygnus blew off its outer layers in a classical nova explosion: an event called Nova Cygni 1992. Light flooded the local interstellar neighborhood, illuminated this existing gas cloud, excited the existing hydrogen, and hence caused the red emission. The only gas actually expelled by the nova can be seen as a small red ball just above the photograph's center. Eventually, light from the nova shell will fade, and this nebula will again become invisible! "

    Pour les amateurs des splendeurs du cosmos: visitez cette page gratuite

    Go >> > http://www.sens-de-la-vie.com/Archepages/vsv_74_beaute-macrocosme.htm


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    [ Message édité par : Alain : 16-11-2004 13:39 ]

    [ Message édité par : Moderateur : 16-11-2004 13:44 ]

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    Francoise
    10272       

    Francoise
      Posté : 16-11-2004 13:43

    Merci M'sieur !

    -> http://www.sens-de-la-vie.com
    Heureusement, Wakan Tanka a prévu l' impermanence !!!

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    Edith
    140     

    Edith
      Posté : 18-11-2004 19:33

    MAGNIFIQUE


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    Alain
    10426       

    Alain
      Posté : 22-11-2004 09:33

    Collision cosmique, le choc de deux galaxies



    Spiral Galaxies in Collision



    Credit: Debra Meloy Elmegreen (Vassar College) et al.& the Hubble Heritage Team (AURA/ STScI/ NASA)

    Explanation: Billions of years from now, only one of these two galaxies will remain. Until then, spiral galaxies NGC 2207 and IC 2163 will slowly pull each other apart, creating tides of matter, sheets of shocked gas, lanes of dark dust, bursts of star formation, and streams of cast-away stars. Astronomers predict that NGC 2207, the larger galaxy on the left, will eventually incorporate IC 2163, the smaller galaxy on the right. In the most recent encounter that peaked 40 million years ago, the smaller galaxy is swinging around counter-clockwise, and is now slightly behind the larger galaxy. The space between stars is so vast that when galaxies collide, the stars in them usually do not collide.



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    Alain
    10426       

    Alain
      Posté : 25-11-2004 19:20

    N'oublions pas le joyau dont nous sommes les gardiens



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    Alain
    10426       

    Alain
      Posté : 28-11-2004 08:49

    Et cette galaxie, n'est-elle pas belle ?



    NGC 2683: Spiral Edge-On



    Credit & Copyright: Doug Matthews & Adam Block, NOAO, AURA, NSF

    Explanation: This gorgeous island universe, cataloged as NGC 2683, lies a mere 16 million light-years distant in the northern constellation Lynx. A spiral galaxy comparable to our own Milky Way, NGC 2683 is seen nearly edge-on in this cosmic vista, with more distant galaxies scattered in the background. Blended light from a large population of old yellowish stars forms the remarkably bright galactic core. Starlight silhouettes the dust lanes along winding spiral arms, dotted with the telltale pink glow of ionized hydrogen gas from this galaxy's star forming regions.



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    [ Message édité par : Alain : 28-11-2004 08:50 ]

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    Alain
    10426       

    Alain
      Posté : 04-12-2004 10:55

    La plus jeune des galaxies (plus jeune que la vie sur terre)



    I Zwicky 18: Young Galaxy
    Credit: Y. Izotov (Main Astronomical Obs., Ukraine), T. Thuan (Univ. Virginia), ESA, NASA



    Explanation: "The Milky Way is an ordinary 12 billion year old spiral galaxy, and even our middle-aged Sun is pushing 4.5 billion years. But all the stars in dwarf galaxy I Zwicky 18 are much younger. In fact, based on Hubble Space Telescope image data, that galaxy's first stars formed only about 500 million years ago, making it the youngest known galaxy. In this view, the bright knots are the two major star forming regions of I Zwicky 18, !embed!ded in expanding filaments of glowing interstellar gas. Scattered, much older background galaxies are seen as small red blobs, and a companion galaxy lies just beyond the upper right corner of the cropped picture. Astronomers believe that diminutive I Zwicky 18 resembles the earliest galaxies formed, but also want to understand how such a young galaxy can be only 45 million light-years away - surrounded by mature galaxies in an aging Universe. The tiny galaxy itself is a mere 3,000 light-years across. "




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