White-hole meaning

A hypothetical space-time singularity similar to a black hole except that matter and energy are emitted rather than absorbed at the event horizon. Though theoretically possible according to general relativity, the existence of isolated white holes is generally considered to be physically impossible because they would violate the second law of thermodynamics, which prohibits the spontaneous reversal of many natural processes.
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A hypothetical portal in space through which matter and energy emerge: thought to be an outlet for black holes.
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(idiomatic) A theoretically possible but physically highly unlikely singularity from which matter and energy are able to escape; the antithesis of a black hole.
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Attributive form of white hole, noun.

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Origin of white-hole

  • white (black) hole
    From American Heritage Dictionary of the English Language, 5th Edition