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Home > News > Tags > black hole
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Stories about: black hole |
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Supermassive black holes are mostly found in galactic nuclei, ejecting matter in the form of particle jets at relativistic speeds during the 'feeding' process. According to theory, these particle jets are accelerated to these speeds by tightly-twisted magnetic fields generated in the close proximity of the ... |
24 April 2008
02:58 GMT |
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Light echoes are generated when interstellar or intergalactic gas is ionized by electromagnetic emissions originating several light years away, and responds accordingly by releasing the surplus energy by emitting light. By observing such light echoes, astronomers can witness events that occurred several hundred of th... |
19 April 2008
04:04 GMT |
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The Theory of General Relativity predicts that objects of great mass - such as stars, neutron stars, black holes and so on - have the ability of severely warping the fabric of space-time due to their powerful gravitational pull. The prediction was first verified in 1919, when Arthur Eddington allegedly detected such ... |
17 April 2008
02:48 GMT |
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John Wheeler died on 13 April, aged 96. He was the first to coin the term 'black hole', helped develop the theory of nuclear fission and one of the great physicists to participate in the Manhattan project, the first program to create a working nuclear weapon during World War II. John Wheeler was born in Jac... |
16 April 2008
05:56 GMT |
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With the help of observations made with NASA, JAXA and ESA's X-ray satellites, astronomers revealed that the supermassive black hole at the center of our galaxy, dubbed Sagittarius A*, suffered a massive outburst some three centuries ago. Sagittarius A* is about 4 million times more massive than the Sun, however... |
16 April 2008
02:52 GMT |
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There are quite a few large laser interferometers in the world today, including the two LIGO detectors in the US, specially constructed to test the existence of gravitational waves, distortions in the fabric of space-time determined by gravitational interactions between very massive cosmic bodies, such as the merging... |
14 April 2008
04:00 GMT |
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Three weeks ago, the Swift satellite detected the brightest gamma-ray burst in the visible universe in a galaxy located more than 7 billion light years away from Earth. It is though that the supernova explosion could have been the result of the collapse of a massive star into a black hole, and that, during the explos... |
12 April 2008
03:47 GMT |
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Globular star clusters are believed to be amongst the oldest objects in the universe, some of them probably being more than 12 billion years old. Our galaxy, the Milky Way, is home to about 200 globular star clusters, amongst which the Omega Centauri star cluster, the biggest and brightest of all. Although it is loca... |
11 April 2008
03:31 GMT |
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Server downtime and maintenance are not the only factors that sometimes block users from reaching their favorite webpages. It's true that server and hosting technical problems are the main reasons the websites fail to load, but researchers have unveiled another mysterious possibility that prevents you from reach... |
9 April 2008
04:16 GMT |
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Quasars are basically massive black holes surrounded by large accretion disks of matter and can be mostly found in active galactic nuclei. As they swallow large quantities of matter, quasars may eject gas into the interstellar space, so that star formation processes are stopped and the galaxy housing it evolves passi... |
9 April 2008
03:37 GMT |
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Weighing supermassive black holes located in the center of galactic nuclei is more like looking through a solid brick wall, since matter in quantities of billions of times the mass of the Sun may stand in the way. Nonetheless, we are capable today to approximate the masses of supermassive black holes just by observin... |
9 April 2008
02:51 GMT |
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Quasars are basically black holes surrounded by large accretion disks of matter spinning around them. As matter is being drawn to the central black hole, it heats up and starts emitting high amounts of radiation, while powerful magnetic fields eject part of the material back into the surrounding space before crossing... |
7 April 2008
09:40 GMT |
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Previous stellar models showed very clearly that all stars must go through a supernova stage at the end of their lives; however, a new study reveals that supermassive stars may not be able to generate supernova explosions, but they would rather suffer a sudden gravitational collapse to turn into a black hole. But if ... |
7 April 2008
08:57 GMT |
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Omega Centauri is one of Milky Way's most massive globular star cluster, located about 17,000 light years away from Earth and containing several millions of stars. Evidence suggests that there may be a massive object in its core, with tremendous gravitational pull, possibly a medium-sized black hole with a mass ... |
2 April 2008
10:32 GMT |
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The biggest black hole ever found in the universe weighs a staggering 18 billion times the mass of the Sun; however, NASA now discovered what seems to be the smallest black hole ever known. It has a mass 3.8 times that of the Sun and a diameter of about 24 kilometers. It was discovered with the help of NASA's Ro... |
2 April 2008
03:37 GMT |
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NGC 2397 is just another spiral galaxy presenting prominent dust lanes along its arms; older stars in its central regions and newly forming stars in the spiral arms are shown blue in this image. The galaxy is located about 60 million light-years away from Earth, however the Hubble Space Telescope is still able to pro... |
1 April 2008
04:06 GMT |
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The Large Hadron Collider is quickly approaching completion and is expected to begin operation by the middle of the this year. However, while physicists are barely waiting to start experimenting with the world's most powerful particle accelerator, campaigners in the United States would give anything to see the L... |
29 March 2008
04:57 GMT |
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The most powerful gamma-ray emission ever seen in the universe was detected yesterday by the Swift satellite, and originated from an area of space more than seven thousand times further away than the distance to the Andromeda galaxy. It was probably created by a massive star in the final stages of life that collapsed... |
20 March 2008
11:30 GMT |
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They are out there, we know what kind of destruction their capable of, however we have also been lucky enough not have such an object forming in the vicinity of our solar system. Or haven't we? Our biggest threat right now, however, doesn't come from black holes, death rays of any kind or other impending di... |
11 March 2008
07:02 GMT |
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Behemoths up to a billion times the mass of our Sun lie in our universe, swallowing up matter to hide it forever from the eyes of any outside observers. Not even light can escape their massive gravitational pull, that's why they are called black holes; they do not emit any form of electromagnetic radiation, thus... |
4 March 2008
09:01 GMT |
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Black holes are some of the most mysterious objects in the whole universe. Except a handful of properties, almost nothing is known about what lies beyond their event horizon, whether it's a wormhole, a ultra-dense singularity or some other structure we have no knowledge about. And here is the worst part of the p... |
14 February 2008
05:31 GMT |
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80 computers, 320 CPUs of power, 640 Gigabytes of RAM and 96 terabytes of hard disk memory. If that's not music to your years, I don't know what music is. Don't be fooled by the name though, the SUGAR complex will be the new supercomputer complex which will help physicists at the California Institute o... |
11 February 2008
04:43 GMT |
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Previously, astronomers believed that only black holes are capable to emit powerful X-ray jets, but a new study conducted at the Penn State University shows that, in fact, any class of object may be able to some extent to form powerful X-ray jets. A newly discovered neutron star seems to present features relatively s... |
5 February 2008
03:01 GMT |
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Wormholes, time travel, white holes, extra spacial dimensions, parallel universes - all arose as solutions to Einstein's equations of general relativity, meaning theoretical physics predicts they should all be likely to exist in the fabric of space-time. But will we ever be able to open a wormhole into space-tim... |
31 January 2008
04:21 GMT |
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Supernova explosions are generally triggered by a unbalance between the gravitational force produced by the star and the thermonuclear fusion reactions. Nonetheless, astronomers argue that such explosions could be determined through more stronger interactions, like those between a white dwarf and a medium size black ... |
30 January 2008
04:49 GMT |
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In 2005, astronomers discovered a star traveling away from the Milky Way at hypervelocities, thus they argued that it must have somehow been ejected from the central regions of the galaxy during interactions with the supermassive black hole. However, HE 0437-5439 posed a great mystery. How could a 35-million-year-old... |
28 January 2008
11:08 GMT |
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Try taking a look at the night sky for a while, from time to time. It's kind of boring, isn't it? Nothing ever happens, there is peace and quiet everywhere you look. Or is it? Astronomers say the universe is a chaotic place, where massive explosions take place all the time in order to release large amounts ... |
25 January 2008
10:21 GMT |
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The Big Bang theory suggests that, in the early life stages of the universe, a massive number of black holes might have been created. Although not as massive as most of the black holes created from stellar remnants, a part of these tiny black holes might still be lurking through space. In the 1970s, the famous physic... |
23 January 2008
06:43 GMT |
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We know teleportation is possible, physicists have previously been able to teleport light particles and electrons, so why aren't we teleporting to work yet? Well, according to scientists, one particle is one thing, E+30 (or 1 followed by 30 zeros) are too many. A human being, or any other large structure for exa... |
21 January 2008
05:52 GMT |
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All matter in the universe is characterized by a number called entropy, which measures the disorder inside an object. Probabilistic calculations reveal that all the stars in the universe might contribute with about 1E+79 units of entropy, or 1 followed by 79 zeros, if you want. However, a recently published study sho... |
19 January 2008
04:46 GMT |
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All known spiral galaxies have supermassive black holes at their center and our Milky Way is no different. However, observing a black hole is rather a difficult task, especially when it is situated in regions of space populated by large amounts of matter such as those in the galactic nuclei of active galaxies. The be... |
17 January 2008
02:47 GMT |
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Black holes have such extreme gravitational fields that anything falling beyond the event horizon is ultimately destined to hit the point-like singularity, where it will probably remain forever. Believe it or not, but stable orbits around black holes are possible. Just because an object has extreme gravitational fiel... |
15 January 2008
04:33 GMT |
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The universe is practically littered with corpses of dead stars, or at least the visible part of the universe is. In fact, most of the matter forming the Earth comes from the bodies of one or more stars that shed part of their material at the end of their lives. However, not all the stars come to share the same fate.... |
15 January 2008
02:53 GMT |
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So I was watching the news bulletin the other day and I heard some of the most outrageous news ever! They were saying something like: 'A giant black hole will swallow the whole Milky Way!' I calmly turned off the TV-set and went to work, searching the Internet for information regarding the elusive black hol... |
12 January 2008
04:00 GMT |
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Though the respective area of sky - where the new X-ray source was discovered - had been surveyed back in 2003, data showed that it hadn't been there at the respective moment. In March of last year, the Chandra X-ray Space Telescope, scanning the general direction of the galaxy Centaurus A located about 14 billi... |
11 January 2008
10:11 GMT |
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It is a well known fact that black holes can spin with extreme speeds, yet new observations conducted with NASA's Chandra X-ray Space Telescope reveal that supermassive black holes could even reach rotation speeds close to the upper limits allowed in the space-time fabric. Not only that, but physicists also pro... |
11 January 2008
06:50 GMT |
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Don't ask me when the end of the world will come, I can't tell you, but one thing is for certain: a black hole could possibly trigger one. Especially taking into consideration the fact that about 30 percent of the total black holes population in the universe is thought to wander alone through space. Add the... |
11 January 2008
04:56 GMT |
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The universe originated in a Big Bang event more than 13 billion years ago, no doubt about that. However, much of its previous history and complexity misses key elements, which are necessary in order to create an accurate theory of the universe's evolution. As space telescopes get better, they enable us to view ... |
11 January 2008
03:54 GMT |
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ESA's gamma-ray space observatory, Integral, detected what seems to be a mysterious cloud of antimatter in the close vicinity of the Milky Way's central core, and its specific shape seems to point towards its origins, as previously there were no valid theories regarding the processes which could be held res... |
10 January 2008
05:42 GMT |
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How massive could a black hole in the universe be? Well, according to astronomers, they can get pretty big. At the American Astronomical Society meeting which took place yesterday, astronomers proposed that most of the massive black holes in the universe could surpass 18 billion times the mass of the Sun! Previously... |
10 January 2008
04:00 GMT |
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The Milky Way, like many other spiral galaxies, is home to a colossal black hole smack in its center, which is though to be the object which keeps most of the galaxy from falling apart. But with billions of other stars, having masses over 5 times that of the Sun, it's natural to imagine that the universe, thus o... |
10 January 2008
03:07 GMT |
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GRB's, or gamma-ray bursts, are the most powerful radiation emissions released during cosmic collisions between massive objects such as neutron stars or possibly black holes. Most of the gamma-ray bursts received from the interstellar medium usually present long period bursts, which are thought to be produced b... |
9 January 2008
05:22 GMT |
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Surely an entry must have an exit; there is no doubt about that. Black holes swallow huge amounts of matter as they travel through space, but where does all that material go? One thing is for certain, it can't stay inside it for a indefinite amount of time, otherwise we probably wouldn't be here right now.... |
5 January 2008
05:44 GMT |
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An intense burst of gamma ray radiation, possibly coming from the Andromeda galaxy, has been detected in February last year, but, while trying to detect the gravitational wave produced by the event which triggered the radiation burst, scientists found there isn't one, thus ruling out the possibility of a mergin... |
5 January 2008
04:39 GMT |
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White dwarfs are believed to be the remnant of a stellar core, after a supernova explosion, which would slowly cool and evaporate as time goes by, but this theory might be soon scrapped as observations made with the Suzaku X-ray space telescope reveals a new type of white dwarf presenting some strange features that h... |
3 January 2008
06:44 GMT |
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Believe it or not, most of the stars and cosmic objects in the visible universe are actually impossible to observe with the naked eye. Only a handful of galaxies and star clusters in the near vicinity of our galaxy can be spotted without the help of optical tools. More than 99 percent of the stars viewed on the nigh... |
28 December 2007
11:10 GMT |
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We used to think that Quasi Stellar Objects or quasars are the most energetic structures in the Universe, but this doesn't seem to be the case with the Milky Way, and why would our galaxy be more special than the others? The quasar is a special type of black hole, which goes through a 'feeding' process... |
27 December 2007
04:08 GMT |
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Once believed to be a type of black holes, neutron stars usually form during the late stages of a star's life. They have masses ranging from 1.4 to 2.1 times that of the Sun and compact the matter in a volume from 20 to 40 kilometers in diameter, causing all matter that falls on their surface to disintegrate int... |
18 December 2007
05:58 GMT |
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The destructive jet particle emission is originated in the supermassive black hole situated in the center of the largest galaxy in the system, 3C321, and extends all the way to the closest galaxy about 20,000 light years away. This is the first jet particle emission observed originating in a galaxy and traveling all ... |
18 December 2007
02:55 GMT |
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