Black holes and white holes?

Question

What is the connection between the two? And I'm looking for complete answers here, don't just say "wormholes." Where does it all fit in?

Answer 1

Back holes are some of the most fascinating objects in the universe because what happens with them seem so bizzare. But there's a simple way you can image this odd astrophysical phenomena

A black hole's "surface" is not solid. The surface is called the event horizon, and it's essentially the point of no return for anything that approaches the black hole. It represents the distance from the black hole's singularity at which the escape velocity equals the speed of light. Anything that passes through the horizon is trapped inside the black hole.

From a distance, a black hole's gravitational pull is no different from that of any other star or other object of the same mass. So if our Sun were suddenly replaced with a black hole of the same mass, for example, there would be no change in Earth's orbit -- the planet would not be "sucked in" by the black hole.

A black hole's surface gravity is stronger than that of a normal star because all of its mass has been squeezed into an almost infinitely small point. But from comparable distances in space, if you judged by gravitational pull alone, you couldn't tell the difference between a black hole and any other object of the same mass.

A white hole is a postulated celetial body that is the time reversal of a black hole. While a black hole acts as a point mass that absorbs any nearby matter that crosses the event horizon, a white hole supposedly acts as a point mass that repels or even ejects matter, acting as an exit to the blackhole. The problem with white holes is that they violate the Second law of thermodynamics (that the total entrophy or disorder of the universe is contantly increasing. Since a white which produces matter adds order to a system, white holes would violate this concept. this is why it is widely believed that white holes don't exist.

But assuming they do, we can discuss how white and black holes might be connected.

The thing linking the Black hole with the theorhetical white hole is the wormhole. the matter which falls into the black hole could suddenly appear coming out of a white hole elsewhere in the universe. However in there are many problems the idea of travelling through a worm hole.  The first problem is that the black hole and white hole would have to be very similar, and so even a small particle could break the symmetry and destroy the worm hole. So the worm hole is a very unstable object. The second problem is that no matter could survive the trip between the back and white hole. The gravity around black and white holes is so large and varies so much in space that anything in the region of a black hole would be ripped apart (Even falling into the black hole, in the first few minutes, any object will be ripped apart into its basic atoms, then these atoms into subatomic particles and so on and so forth)

Answer 2

... Time to clear up some misconceptions. First of all, a white hole is nothing more than the inverse (CPT?) of a black hole, and is therefore nothing but a theoretical construct. Although they can exist mathematically as solutions to the Einstein field equation, creating a white hole would be tantamount to destroying a black hole. Since you can't destroy a black hole (since all matter/energy is simply sucked in), but only wait for it to evaporate, creating a white hole is impossible. Now, however, there is a circumstance under which it would be possible to encounter a "white hole". If you were to fall into a black hole which is either charged or rotating, instead of simply being crushed as you approach the singularity, there are actually two event horizons which divide space-time up into three regions. There is the Outside, there is the space between the two event horizons, and there is the Inside. Now, when you pass the outer event horizon, you reach the between space in which you are accelerated inevitably towards the inner horizon. However, once you have passed the inner horizon, you do not inevitably fall towards the singularity, which is interesting. However, what is even more interesting is the fact that under certain conditions, a repulsive force can develop between you and the singularity. And if you enter the black hole properly, a curious distortion of space-time occurs. You will appear to be in another universe, this one of certainly infinite extent. At the "center" there will be what seems to be a singularity. However, this singularity is not black but white; it is where you just came from (I know it seems like you fell into a spherical region from outside, not out of a singularity fro the inside, but space-time has been turned inside-out!) This is what you can call a white hole. And the further away you move from the white hole, the closer you get to the actual singularity of the black hole. But since you can never reach it due to the escalation of the repulsive forces, it simply seems like you can keep travelling forever. Yes, what used to be a finite interval of space in your "before" perception whose end you could never reach, only approach asymptotically - has been transformed into an infinite interval of space whose end you can never reach but in which you can travel linearly at a constant velocity. Relativity is strange, isn't it?

Answer 3

Mostly white holes, or wormholes as they are commonly thought of, fit in when it comes to string theory. String theory states that there are numerous planes of existence floating through space and that when two white holes line up, it would be possible to create a wormhole that would cut travel into ribbons. White holes are like blackholes because they are a dip in the fabric of space and time. However, they are unlike blackholes because they do not have an immense center of mass, called a singularity, like blackholes do. White holes, instead of eating the matter of space, spits it back out.

Answer 4

Black holes are created when the gravitational pull of an object (star) is so strong it collapses onto itself and no form of matter, not even light, can escape its gravitational pull (if it crosses the event horizon). White holes' gravitational pull is so weak that nothing can enter them and it ejects matter. Black holes and white holes both exists in theory, but only black holes exist in this universe. White holes contradict the theory of conversation of matter, because if it ejects matter, then where did it come from? Since it can be neither created nor destroyed (energy)

Answer 5

Black holes and white holes are theoretically the exact opposite of eachother. A black hole has a strong gravitational pull while a white hole "spits" everything out. They are hypothesized as being connected; the black hole pulls matter in and goes through the white hole which spits it back out. However, they are completely theoretical and we have no evidence at all as to whether or not they exist.

Answer 6

To add to what Kdesky said. There is allot of evidence suggesting the existence of black holes, such as stars orbiting companions which seem to be invisible (as a black hole would be).

Answer 7

are you referring to like this, where Stephen Hawking refers to black holes then parallel universes (or alternate) that have holes that release more energy or matter "information"