What are white holes in space?

Answer 1

White Holes

White Holes are the theoretical exact opposite of black holes, and their existence is implied by a negative square root solution to the Schwarzchild metric. The Schwarzchild metric is based on General Relativity, which is time symmetric. This means that the most technical definition of white hole is simply a black hole running backwards in time. It is a location in space time that, instead of being impossible to escape, is impossible to reach.

Under the definition given by the solution to this equation they repel everything, including massive particles as well as photons, nothing can enter them. We have never discovered a white hole, and given these properties we believe that they would be rather difficult to miss. Furthermore, an object that acts in this manner directly violates the second law of thermodynamics which states that heat naturally flows from a region of high temperature to a region of low temperature.

The contradiction this causes is that any object with heat should eventually dissipate it's heat energy to its surroundings, and a white hole by definition never runs out of heat or mass, thus standing in violation of every other major law of physics we have in order to hold true to the second law of thermodynamics.

This, however, only applies to our universe. The same equations that suggest the existence of white holes also seem to imply that they exist in a universe parallel to our own, and would exist connected to a black hole by way of a worm hole in order to complete the Schwarzchild geometry suggested by the equation which predicted the existence of black holes. This worm hole joining 2 separate universes is known as the Einstein-Rosen bridge and is one of the most fascinating concepts in theoretical physics.

While the concept of this connection is extremely exciting we know very little about it, as we have no white holes to observe and black holes are extremely hard to detect given their light absorbing nature. Given our current understanding of black holes and white holes we are not even sure of such a connection could exist, or if it did, where it would take us. Current knowledge does not even give enough information to suggest if such a link would even be to somewhere else in our own universe.

Unfortunately, current theory does not even allow for the ultimate destination of a worm hole to be much of a worry because it is believed that passing through a worm hole is impossible. Instant death would be a near certainty given any imaginable method of protection, and no matter the circumstances return would be impossible given everything we know about black holes and the way they would interact with white holes.

The only method where death would not be a near certainty is if a worm hole could somehow be stabilized for longer than the brief amount of time under which they are naturally believed to remain stable. This is an impossibility given our current understanding of science and would obviously be grander in scope than anything ever attempted by mankind in the history of Earth.

It is theoretically possible, although highly improbable that a worm hole could somehow be stabilized to allow safe passage through it. The only theoretical way this could be done that I was able to find involves using 'exotic matter', or matter unlike any we know, highly exotic matter. In order to stabilize the worm hole the throat of the singularity would have to be threaded with this matter which would be spherical in nature. The properties this matter would have to have would be negative mass, and yet still be capable of exerting a positive surface pressure.

It must have these two properties for very specific reasons, the negative mass ensures the the throat of the worm hole lies outside the protected region and the positive surface pressure is the property that prevents the throat of the worm hole for collapsing. These properties of matter are not arbitrary or purely theoretical, we have determined this is the type of space-time geometry most likely needed to produce a stable worm hole. Einstein's equations then specify what the energy-momentum content of matter must be in an area to produce the needed geometry. From as general a standpoint as a matter such as this can be, these are the properties normally suggested to be needed to stabilize a worm hole. As a side note, the notion of negative mass matter is certainly rather disturbing, however because of vacuum fluctuations near a black hole it is not considered to be an impossibility.

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In astrophysics, a white hole is a postulated celestial body that spews out matter, in other words an anti-black hole, or the time reversal of a black hole.

White holes have long been speculated about in Science Fiction. They have been postulated as a means of transport between points of spacetime and even different universes. Due to a black hole's suggested funnel-like nature, matter travelling through a black hole and exiting through a white hole would be crushed to an immensely dense but small size, this would go against transportation because it is very unlikely that a white hole would have the ability to recompose the matter to its original state prior to entering the black hole. The existence of white holes is hypothetical, as they appear to violate the second law of thermodynamics.

Other speculations include the hypothesis that quasars are actually white holes instead of supermassive black holes.

Answer 2

The short answer is that a white hole is something which probably cannot exist in the real universe. A white hole will turn up in your mathematics if you explore the space-time around a black hole without including the star which made the black hole (ie. there is absolutely no matter in the solution). Once you add any matter to the space-time, the part which included a white hole disappears.

Answer 3

Definition:-
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 attracts and absorbs any nearby matter, a white hole acts as a point mass that repels or even (perhaps) ejects matter.

Origination:-
White 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].

The existence of white holes that are not part of a wormhole is doubtful, as they appear to violate the second law of thermodynamics.

Quasars 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.

Answer 4

There is no evidence whatsoever that white holes exist. If they did they would be the other side of black holes, kind of like where all that stuff that gets sucked in comes out.

Answer 5

White holes decrease entropy, therefore not possible, therefore no.

Answer 6

I have heard of black holes in space. White holes could be the fairer sex.

Answer 7

when black holes happen it suks everything in. well somethings gotta give when that happens so its a white hole.what goes into a black hole must somehow come out. wite hole is like a black hole in reverse.

Answer 8

Gases

Answer 9

a way to another space.

Answer 10

Last I heard it, whitehall was in London