In general relativity, a white hole is a hypothetical region of spacetime which cannot be entered from the outside, although matter and light can escape from it.
Questions tagged [white-holes]
102 questions
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Could the black hole in the center of the galaxy be a white hole?
In the center of the galaxy there is a strong radio source which we call Sagittarius A*. Based on the high speed and orbit of nearby stars we have calculated that something with the mass of more than 4 million Sun’s is located in this small area of…
Enos Oye
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Do colliding black holes violate time reversal symmetry?
Two black holes can collide and merge into one bigger black hole, but not split into two. Does this mean colliding black holes violate time reversal symmetry?
Related: Do black holes violate T-symmetry? Based on the answer to that question,…
Allure
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Entering a black hole, jumping into another universe---with questions
I'm quite familiar with SR, but I have very limited understanding in GR, singularities, and black holes. My friend, which is well-read and is interested in general physics, said that we can "jump" into another universe by entering a black…
Sawi
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Collision of a black hole & a white hole
A black hole and white hole experience a direct collision.
What happens? What shall be the result of such a collision?
Alexey Bobrick
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Is there a way to move a black hole?
Is it possible to move or transport a black hole? What about a white hole?
Euphorbium
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Is it mathematically possible for a black hole to be connected to a white hole or a worm hole?
I know that there's no evidence at this point for "white holes" however would it even be mathematically possible for a black hole to be connected to a white hole (total opposite so everything would be expelled, after some really extreme physical…
katrijnn
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Diving into a charged (Reissner-Nordstrom) Black hole
Apparently there are two event horizons in this type of black hole, where the second one is known as the Cauchy horizon. According to Carroll, if you go into the first one, you will fall until you reach the second one, at which point you are free to…
JLA
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Where does light go after it enters a black hole?
Nothing passes through a black hole.
Where do things go then? If light enters a black hole, what happens to it?
Do things go to a white hole and resume in another universe?
Foolish
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Penrose diagram of hypothetical astrophysical white hole
Assuming classical physics (no Hawking radiation), spherical symmetry, and no charge, Penrose diagrams are well known for the maximally extended Schwarzschild solution, for the theoretical (not maximally extended) black hole, and for a real…
safesphere
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Falling to a white hole
White holes, if they exist (unlikely but still fun to think about), are regions of space that can't be entered.
They are time-reversals of black holes (GR is time-symmetric). However, a time reversal of gravitational attraction is still…
Kevin Kostlan
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Do new universes form on the other side of black holes?
I have four questions about black holes and universe formations.
Do new universes form on the other side of black holes?
Was our own universe formed by this process?
Was our big bang a black hole seen from the other side?
Are there solid reasons…
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White hole and Schwarzschild solution
What is the relation between white hole and the Schwarzschild solution commonly found in textbooks of physics and interpreted usually as black hole?
Leos Ondra
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What Would a White Hole Look Like?
I know it is merely hypothetical, but I am rather curious about what would it look like if it was real.
For instance: a Black hole: that would have a 100% black sphere, called the event horizon caused by the light that gets pulled and never comes…
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Are white holes made of exotic matter
I have recently watched Kurzgesagt in a Nutshell's video on Wormholes https://www.youtube.com/watch?v=9P6rdqiybaw and I have been thinking about white holes, and exotic matter.
As I understand, white holes are an exact opposite of black holes, Black…
rcw
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Have scientists been able to find an example of a possible White Hole?
We went to a planetarium last night last night and watched "Black Holes" narrated by Liam Neeson. If I recall correctly, he said that scientists believe that they have identified a number of Black Holes, and that they think there are White Holes at…
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