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Horizon (general relativity)
There are several types of spacetime horizons that play a role in Einstein's theory of general relativity:
* Absolute horizon, a boundary in spacetime in general relativity inside of which events cannot affect an external observer
* Apparent horizon, a surface defined in general relativity
* Cauchy horizon, a surface found in the study of Cauchy problems
* Cosmological horizon, a limit of observability
* Event horizon, a boundary in spacetime beyond which events cannot affect the observer
* Killing horizon, a null surface on which there is a Killing vector field
* Particle horizon, the maximum distance from which particles can have travelled to an observer in the age of the universe
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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