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singularity comparison table
Subject has antonym is part of is a kind of has frequency has wavelength has acronym has acceptance statu obey has synonym has definition has charge
black holewhite holedark halomassive compact halo objectinversely proportional to the wavelengthinversely proportional to its momentumMACHOhypotheticaluncertainty principlehidden massA gravitationally collapsed mass inside the Schwarzschild radius (q.v.), from which no light, matter, or signal of any kind can escape. A black hole occurs when the escape velocity of a body becomes the velocity of light (2GM / R = c2). If an object with the mass of the Sun had a radius of 2.5 km, it would be a black hole. Black holes represent one of the possible endpoints of stellar evolution for stars very much more massive than the Chandrasekhar limit. 
naked singularity  singularity      A singularity that will be visible and communicable to the outside world. 
Schwarzschild singularity  singularity      The center of a black hole. According to Einstein's theory of general relativity, the entire mass of a black hole is concentrated at a point at its center, the "singularity". It is believed that quantum mechanical effects, not included in the theory, would cause the mass to spread out over a tiny but nonzero region, thus preventing an infinite density of matter and doing away with the singularity. 
white holeblack hole singularity      The time-reversal of a black hole. A white hole is a singularity from which matter emerges unpredictably, but into which matter cannot enter. The initial singularity of the standard big bang theory is an example of a white hole. It can be shown that the creation of a new universe from a false vacuum bubble in the context of classical general relativity would require a white hole singularity, which means essentially that it cannot be done, even in principle. However, a false vacuum bubble could conceivably grow to become a new universe through a process of quantum tunneling. 
wormhole  singularity      A tube-like region of space connecting one region of the universe to another. 

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