In general relativity, a white hole is a hypothetical region of spacetime and singularity that cannot be entered from the outside, although energy-matter, light and information can escape from it. In this sense, it is the reverse of a black hole, from which energy-matter, light and information cannot escape. White holes appear in the theory of eternal black holes. In addition to a black hole region in the future, such a solution of the Einstein field equations has a white hole region in its past.[1] This region does not exist for black holes that have formed through gravitational collapse, however, nor are there any observed physical processes through which a white hole could be formed.
Supermassive black holes (SMBHs) are theoretically predicted to be at the center of every galaxy and that possibly, a galaxy cannot form without one. Stephen Hawking[2] and others have proposed that these supermassive black holes spawn a supermassive white hole.[3]
^Carroll, Sean M. (2004). Spacetime and Geometry (5.7 ed.). Addison-Wesley. ISBN 0-8053-8732-3.
^Hawking and Penrose, The Nature of Space and Time (Princeton, 1996)
In general relativity, a whitehole is a hypothetical region of spacetime and singularity that cannot be entered from the outside, although energy-matter...
A black hole is a region of spacetime where gravity is so strong that nothing, including light and other electromagnetic waves, is capable of possessing...
of most massive black holesWhitehole /big bang/supermassive black hole Pathria, R. K. (1972). "The Universe as a Black Hole". Nature. 240 (5379): 298–299...
is the theoretical thermal black-body radiation released outside a black hole's event horizon. This is counterintuitive because once ordinary electromagnetic...
A stellar black hole (or stellar-mass black hole) is a black hole formed by the gravitational collapse of a star. They have masses ranging from about...
black hole interior region that particles enter when they fall through the event horizon from the outside, there must be a separate whitehole interior...
smallest possible black hole that could exist while rotating at a specific speed Whitehole, the opposite of a black hole; a whitehole continuously expels...
compact object (or compact star) refers collectively to white dwarfs, neutron stars, and black holes. It could also include exotic stars if such hypothetical...
yourself (4) appears and gives you a portable whitehole. You use the portable whitehole to escape the black hole. Another future version of yourself (6) appears...
A supermassive black hole (SMBH or sometimes SBH) is the largest type of black hole, with its mass being on the order of hundreds of thousands, or millions...
outline is provided as an overview of and topical guide to black holes: Black hole – mathematically defined region of spacetime exhibiting such a strong...
They cannot lose enough mass to form a white dwarf, so they will leave behind a neutron star or black hole remnant, usually after a core collapse supernova...
Hertzsprung–Russell diagram Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red...
1922. White dwarfs are thought to be the final evolutionary state of stars whose mass is not high enough to become a neutron star or black hole. This...
A blue hole is a large marine cavern or sinkhole, which is open to the surface and has developed in a bank or island composed of a carbonate bedrock (limestone...
theoretical astrophysicist and cosmologist. Novikov put forward the idea of whiteholes in 1964. He also formulated the Novikov self-consistency principle in...
demonstrates that Planck stars may exist inside black holes as part of a cycle between black and whiteholes.[clarification needed] A somewhat analogous object...
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