2006-07-18 19:46:48 · 5 answers · asked by pnagro 1 in Education & Reference ➔ Trivia
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.
The existence of white holes that are not part of a wormhole is doubtful, as they appear to violate the second law of thermodynamics.
2006-07-18 20:07:20 · answer #1 · answered by ♥Hina♥ 4 · 0⤊ 0⤋
n 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.
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.
White holes have long been speculated about in science fiction, see White holes in fiction.
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2006-07-19 02:00:18 · answer #2 · answered by akar 4 · 0⤊ 0⤋
yes,I saw it on my way to work
2006-07-18 20:07:53 · answer #3 · answered by tanker 2 · 0⤊ 0⤋
may be
i also have heared it before.
lets go, find it.....
2006-07-18 20:00:46 · answer #4 · answered by dell 1 · 0⤊ 0⤋
WAT"???
2006-07-18 19:57:27 · answer #5 · answered by Siva 2 · 0⤊ 0⤋