How can you define a hole in space time?
486668
it's called a 'temperal rift' on Stak Trek
314377
Masses with large gravitational field bend space all the time. Light traveling towards a star bends at close proximity and strengthens out when its farther away.\n\nBlack holes are said to hold immense gravitational field that not only does it bend space and time, it can also rip a hole through our 4-dimensioned universe.
1034214
A hole in what? As far as science can tell, the universe is everything there ever was, is now, or ever will be.
475057
Space time is the total of all demsions.  They as you may know are height, length, depth, and time.  Time is the fouth demsions because things take time to move.  However time an dspace are theorized to be somehow related.  In this case they would have similar measuremants becuase of that relation.  We can't truly define time, or space.  Space could be infinite and that the universe just sits in it.  Time could also be inifite and yet everything we know as time could just be an event in it.  Humans set a try finite number to infinity sometimes, hence it's given the name the name the "limit".  There's always more to find in this vast, endless world of ours, but all those things will definitely not be found in our liftime.  Maybe, if you believe in this, we'll see the human race find the answers while the rest of us are in heaven.
522523
When all matter, including light and time, is sucked into a black hole, an infinitely dense singularity occurs. With all this heavy-duty cosmic attraction going on, something has to give, right? Enter white holes. \n\nPut simply, the idea here is "what goes into a black hole must somehow come out." If a black hole tears the space-time fabric of "our universe" creating a wormhole, a white hole would be the entry point into the "other universe." Essentially, a white hole would be the mathematical exist that emits matter n light just opposite to black hole
1095417
A black hole is a spacial anomalie with an extremely high gravitational mass, and supercondenses matter into an infinitismally small singular. If all the matter in the universe could be condensed into a ball the size of a speck of dust, then the size of the ball inside a black hole would be a fraction of a fraction of that, too small to see with the most powerful microscope on planet Earth. The hole however is much different, similar to a funnel. So at different points in the hole the size measurement is different. There is no actual hole however, more like a bend in the fabric of space, so nothing ever actually leave the universe, only changes density, form and location, among other things.
21273
I've heard some call black matter a blackhole. The honest truth is we just dont know. Its a theory nothing more. A human concept to TRY to understand something. \n\nLike the notion of "time". We measure that based on our small experiences within our solar system. For all we know there could be a larger, grander universal measurement.
661081
A black hole is a concentration of mass great enough that the force of gravity prevents anything past its event horizon from escaping it except through quantum tunnelling behaviour (known as Hawking Radiation). The gravitational field is so strong that the escape velocity past its event horizon exceeds the speed of light. This implies that nothing, not even light, inside the event horizon can escape its gravity. It is, however, theorized that wormholes can provide an exit path for energy or matter. The term "black hole" is widespread, even though it does not refer to a hole in the usual sense, but rather a region of space from which nothing can return.
989936
Curved spacetime.\n\nThere is nothing unduly special about the event horizon (ie it has no discontinuities). And very large black holes do not have unduly curved spacetime at their event horizons (the curvature of the supermassive black hole at the centre of our galaxy is on 20 times greater than that here on Earth, and here on Earth the curvature is pretty much undetectable).
790112
A black hole is an object predicted by general relativity with a gravitational field so strong that nothing can escape it — not even light.\n\nA black hole is defined to be a region of space-time where escape to the outside universe is impossible. The boundary of this region is a surface called the event horizon. This surface is not physical, just an imaginary boundary. Nothing can move from inside the event horizon to the outside, even briefly.\n\nThe existence of black holes in the universe is well supported by astronomical observation, particularly from studying X-ray emission from X-ray binaries and active galactic nuclei. It has also been hypothesized that black holes radiate energy due to quantum mechanical effects known as Hawking radiation. \n\nHistory\n\nThe concept of a body so massive that even light could not escape was put forward by the English geologist John Michell in a 1784 paper sent to the Royal Society. At that time, the Newtonian theory of gravity and the concept of escape velocity were well known. Michell computed that a body with 500 times the radius of the Sun and of the same density would have, at its surface, an escape velocity equal to the speed of light, and therefore would be invisible. In his words:
549712
In astrophysics, a white hole is a postulated celestial body that is the time reversal of a black hole. While a black hole acts as a point mass that draws in matter, a white hole acts as a point mass that repels matter.\n\nWhite holes appear as part of the vacuum solution to the Einstein field equations describing a Schwarzschild wormhole. One end of this type of wormhole is a black hole, drawing in matter, and the other is a white hole, emitting matter. While this gives the impression that black holes in this universe may connect to white holes elsewhere, this turns out not to be the case for two reasons. First, Schwarzschild wormholes are unstable, disconnecting as soon as they form. Second, Schwarzschild wormholes are only a solution to the Einstein field equations in vacuum (when no matter interacts with the hole). Real black holes are formed by the collapse of stars. When the infalling stellar matter is added to a diagram of a black hole's history, it removes the part of the diagram corresponding to the white hole [1].\n\nThe existence of white holes that are not part of a wormhole is doubtful, as they appear to violate the second law of thermodynamics.\n\nQuasars and active galactic nuclei are observed to spew out jets of matter. This is now believed to be the result of polar jets formed when matter falls into supermassive black holes at the centers of these objects. Prior to this model, white holes emitting matter were one possible explanation proposed.
711640
Sorry to Sun of Samsa.  I meant to give you a thumbs up!  The Black Hole Singularity is infinitely small (infinite density and ZERO volume).  The effects of the hole can be miles or light years across!
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.
663273
We have found black holes in the universe but never a "White hole". A white hole is a concept that arises out of tweaking Einstein's equation. Theoretically a white hole would be connected to a black hole through space time and it would spew out all the matter and energy that the black hole sucked in. The issue is that the white hole emerged from looking at einsteins equations in a vacuum with no matter. Mathematically this connection would be highly unstable and would most likely disappear as soon as it formed. But mathematically this situation could happen. It has never been found though. I hope that helped
193740
As far as anyone knows a black hole is actually a singularity.  a the amount of mass in any giving point of space is too much for spacetime to hold any escaping light particals, (which makes us believe that no particals can escape because we currently believe light is the fastest particle.)... a Singularity means all our tests result in a loop.  Einstine and Rosenburg believed it may have punched a hole into spacetime, creating a "bridge" later known as a "wormhole"  which is the exact opposite of a black hole... all the matter and particles sucked into a black hole would fly out of the white hole.... at least that is what I got from physics... I was half asleep through most of it.
50817
A white hole is a proposed celestial body which ejects matter into space-time.  It can be considered the exact opposite of a black hole.  Many models suggest that the 'shape' of a black hole is somewhat like a tunnel.  White hole theories take this one step further and suggest that matter which falls into a black hole is ejected at the 'other end' by the white hole.  Some theorize (although this is mostly the realm of science fiction) that white holes open into other universes.  To date, no object meeting the description of a white hole have ever been recorded.
591084
Another name for a black hole is "Quantum Singularity"\n\nAll the matter in the black hole has collapsed under its own weight to an infinitely small point. (there's the clue)\n\nAn infinitely small point would have no Length width or depth.\nAs time ceases from our perspective, once inside the event horizon, there is no time.\n\nHence a black hole is dimensionless no space/no time.\n\nWell that's how I see it anyway!!\n\nLet the argument rage on