black hole

Cosmic body with gravity (see gravitation) so intense that nothing, not even light, can escape. It is suspected to form in the death and collapse of a star that has retained at least three times the Sun's mass. Stars with less mass evolve into white dwarf stars or neutron stars. Details of a black hole's structure are calculated from Albert Einstein's general theory of relativity: a “singularity” of zero volume and infinite density pulls in all matter and energy that comes within an event horizon, defined by the Schwarzschild radius, around it. Black holes cannot be observed directly because they are small and emit no light. However, their enormous gravitational fields affect nearby matter, which is drawn in and emits X rays as it collides at high speed outside the event horizon. Some black holes may have nonstellar origins. Astronomers speculate that supermassive black holes at the centres of quasars and many galaxies are the source of energetic activity that is observed. Stephen W. Hawking theorized the creation of numerous tiny black holes, possibly no more massive than an asteroid, during the big bang. These primordial “mini black holes” lose mass over time and disappear as a result of Hawking radiation. Although black holes remain theoretical, the case for their existence is supported by many observations of phenomena that match their predicted effects.

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Hole or Holes may refer to:

  • a confined lack of structure in some part of an object
  • an individual section of a golf course
  • Black hole, an object with an immense gravitational field
  • Electron hole, in physics and electronics, the absence of an electron in the valence band.
  • News hole
  • Ozone hole, in climate and environmental sciences, a large and seasonal decrease in stratospheric ozone over Earth's polar regions since the late 1970's (see ozone depletion, too).
  • Punchhole, for filing paper
  • Hole cards in Poker
  • Memory hole, which has multiple meanings
  • Portable hole, a device used in animated cartoons and games
  • Hole (football), a region or position in a football team formation
  • In horse racing, a horse's post position in the starting gate
  • Shortened form of hollow, meaning a valley
  • "The hole", a slang term for solitary confinement

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