How is the BLACK HOLE creation?
473814
General relativity (as well as most other metric theories of gravity) not only says that black holes can exist, but in fact predicts that they will be formed in nature whenever a sufficient amount of mass gets packed in a given region of space, through a process called gravitational collapse. For example, if you compressed the Sun to a radius of three kilometers, about four millionths of its present size, it would become a black hole. As the mass inside the given region of space increases, its gravity becomes stronger — or, in the language of relativity, the space around it becomes increasingly deformed. Eventually gravity gets so strong that nothing can escape, an event horizon is formed, and matter and energy must inevitably collapse into a singularity.
280455
It is an interesting idea, but for the moment, only an idea. The cosmology behind black holes is pretty sound, and they have been observed now, such as in Cygnus x-1.
775784
Black holes as mentioned above are a singularity.  Nobody really knows what happens once you cross the event horizon ( the edge of the black hole).  These are very strange events in that they pull everything including light towards them, which contradicts Newtons second law with mass being proportional inversely proportional to mass ( as light has no mass) and Einstein's theory of relativity and the conservation of mass and energy.  All theory we have breaks down when we encounter black holes.\n\nAn interesting theory is that black holes are a link to another universe, matter passing through a black hole and appearing through a white hole in another universe.  This theory has the assumption that there is more than one universe and that they are all linked.  Stephen Hawking's "A Brief history of time" gives many interesting insights.  \n\nHe has recently changed some of his views however with a new theory that a Universe is created by the bumping of one universe into another with black holes becoming the remanents of the reaction, and thus there is no begining or end to time.  He is publishing his ideas soon.  In short however nobody really knows what happens in a black hole.
1169308
It's a planet.  Planets are too small to be blackholes.  I will ignore the second part of your question.
732455
I do not think the Chandrashekar limit is required to maintain a black hole. To create one, this limit is the minimum mass required. But once formed, I think, a black hole remains a black hole, no matter how much matter it dissipates, till, of course, it dissipates everything and ceases to exist.
943441
Hey, I'm gonna give you the truth instead of spilling abunch of theories at you. \n\nNobody knows. Black holes and everything related to them are one of the most mysterious things out there. Not that we REALLY know much else about whats going on out there. Everything so far is based on theories drawn from basic laws of physics. \n\nWho knows, maybe you and I will live to see the day they can tell us it is a fact. I hope so, there are many questions I would like to know the answers to. =)\n\nEDIT: Bill, I believe the theory I last heard on that is as follows: \n\nOnce a black hole has nothing else to 'feed' on it will collapse. Scientist recently believed that the end of the universe was gonna be in a black hole, a super massive black hole, that was thought to be in the location of where the Big Bang took place. They assumed that the universe would quit expanding and retract on itself. They recently found out that they were COMPLETELY wrong in that assumption. In fact, the universe is expanding at a faster rate then it originally was. Their new theory is that the universe will continue to expand, eventually breaking down everything in the universe (sun, moons, and planets encluded). True? Couldn't tell you honestly, they may come up with a different theory tomorrow.
520554
Small black holes disappear in a puff of Hawking radiation, pretty rapidly.\n\nThey don't really need containment. They just evapourate into thermal radiation.  It's only the dirty great big ones that could smash the place up.  Making one of these on earth is just not feasible.  The ones that occur naturally in the universe are rather a long way off.\n\nNothing to worry about.
1138674
A star is stationary object and a black hole is a result of dying star. Black holes are stationary objects.\nThey posses a great gravitational force. It is so great that it can even suck in light.\nDue to such gravitational force it makes objects near it to revolve around it with tremendous speed.\n\nThe closest black hole to earth lies just 1,600 light-years \n(1 light year = 9.4605284 × 10^15 meters ) from Earth on the way to the centre of the Milky Way in the direction of the constellation Sagittarius.\n\nBut if you want to test the above facts and experience it yourself then just wait till sun becomes one black hole!!!! (after around 5-6 billion years)  (Sun can also become neutron star or nebula so may be you cannot experience it!!)
1166146
Yes........more or less. A Black hole is a small view of what the universe as a whole will be like billions of years from now.
704974
The writings of Stephen Hawking should answer most of your questions about black holes. Show people that you have learned from previous questions that you have asked about black holes by including information in the question details, or why it is relevant.\n\nTry choosing a best answer yourself, instead of leaving it to a vote. This will mean actually reading the answers given. You can learn a thing or two.
13556
There are theoretically two ways in which black holes can form.  Stellar (star) sized black holes have to be above the Chandresekhar limit of 3.2 solar masses, and are formed through the gravitational collapse of stars. They can form whenever conditions are right. These are the types of black holes that astronomers infer from binary X-ray sources and the like.\n\nMicro black holes, on the other hand, can only have been formed in the initial moments of the Big Bang, when intense pressures during cosmic expansion could have collapsed masses smaller than our sun into singularities.  According to Dr. Stephen Hawking's theory of black hole evaporation, all singularities lose mass, through a type of evaporation (the actual mechanism, having to do with vaccum energy and particle/antiparticle pairs is a bit complicated) with smaller black holes evaporating faster than large ones.  By this logic, most micro-holes would have evaporated out of existence in the thirteen billion years the universe has been around, while the larger micro-holes (things with the mass of, say, Neptune) should still be around, though hard to spot.
762962
no, but i can tell you what we think it is:\n\nit is a star whose gravity is too great for the nuclear fusion in its core to negate.  it collapses in on itself and goes supernova.  then it is a neutron star.  if the gravity is still too great, it collapses some more and becomes a black hole.  its gravity is so strong that light itself cannot escape it (thus it is 'black').  they are suspected to be at the center of many galaxies, especially quasars and other active galaxies.  one is believed to be at the center of our own galaxy, the milky way.\n\nonce again, no one has really seen one, just the indirect evidence that one exists (strange star orbits, gas being sucked into nothing, strange bursts of some kind of rays (can't remember what kind) coming out of the poles, etc.\n\neverybody is pretty convinced that they exist.  its just kinda hard to prove.\n\nps the idiot down there who said black holes are dead galaxies has no clue what he is talking about. please ignore him.  and its not the size of an atom, its an infinitely small point, the swartzchild point.
368768
A black hole is were a star once lived. Try this link for more details:\n\nhttp://www.cem.msu.edu/~cem181h/projects/98/TBA/Created.htm
241248
try here\nhttp://en.wikipedia.org/wiki/Black_hole
1145852
Nothing; the "hole" in space isn't like a hole in your shirt, but rather like a giant pit.  What falls in stays in (of course, this is a three-dimensional hole that sucks stuff in from all directions, but we'll stick with the hole-in-the-ground analogy for simplicity)\n\nWhat has been discovered mathematically by people like Hawking and Chandrasekhar is that black holes actually do give off radiation (so-called Hawking radiation) through its effects on local space-time right at the event horizon.  At this specific region of space, charged pairs of virtual particles appear, and every now and then, rather than rejoining and annihilating each other in a tiny flash of light, one particle escapes and goes flying off away from the black hole while the other gets drawn in.  The escaping particle is considered matter, while the one getting drawn in becomes antimatter.  As the antimatter reaches the center of the black hole, it cancels an equal mass of matter and the black hole gets infinitessimally smaller.  An old black hole (one that has consumed all the matter in its vicinity) therefore gradually "evaporates" over a VERY LONG TIME (about 10^61 times the age of the Universe for a 30 solar mass black hole!) until its mass is so small that its gravity is no longer strong enough to hold in light, and it may do any number of things -- explode, fade out and become a really big hunk of red-hot metallic stuff, sit and remain a giant, dark gravity well... depends on what kind of math you like and the current theories at the time you calculate it.
196389
Like all gravitationally-formed objects, a black hole is roughly spherical in shape (like planets and stars, a rotating black hole will be slightly flattened at the poles.)  According to Hawking's theory, black holes do emit radiation (and therefore mass) in accordance with quantum rules.  Theoretically, given enough time a black hole could radiate away enough of its mass to disappear completely.  When its mass drops below a certain critical threshhold, the remaining mass of the black hole would disappear in a final violent burst of gamma radiation.  Unfortunately (or perhaps fortunately) the best estimates we have for the time it would take for a black hole to explode in this way is far longer than the current estimated age of the universe, so it is not likely we would be able to test this theory through direct observation.
375753
As far as I know, there are only 2 real-life examples of such a process: the Big Bang and a black hole.\n\nThe Big Bang caused 'everything' to expand into 'nothing'. That in itself is an infinitely large expansion; it's like dividing infinity by 1.\n\nA black hole is, in essence, where matter collapses to zero size, thus reaching infinite density and creating a hole in space-time. Little is known about the interior of such black holes, or, indeed, if there is such a concept.