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physical object > natural object > particle > hypothetical particle > dark matter > massive compact halo object > black hole > extremal black hole
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extremal black hole comparison table
Subject is a kind of has definition
black holemassive compact halo objectA 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.
extremal black holeblack holeBlack hole endowed with the maximal amount of force charge possible for a given total mass.

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