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| The '''event horizon''' is a boundary beyond which information will never reach an observer. An event horizon is a mathematical construct and not a physical object and a person passing through an event horizon will not notice any | The '''event horizon''' is a boundary beyond which information will never reach an observer at a given location in ]. An event horizon is a mathematical construct and not a physical object and a person passing through an event horizon will not notice any | ||
| odd behavior. From an outside observer however, an object passing though an event horizon will appear redder and dimmer and will appear to freeze at the moment the object passes the event horizon. | odd behavior. From an outside observer however, an object passing though an event horizon will appear redder and dimmer and will appear to freeze at the moment the object passes the event horizon. | ||
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| ] where a ] exists without an event horizon is possible. | ] where a ] exists without an event horizon is possible. | ||
| Hypothetically, an event horizon can also exist in a ]. When a universe expands quickly enough, for example a ], it can be possible for an event horizon to exist |
Hypothetically, an event horizon can also exist in a ], for an observer at a given location in ]. When a universe expands quickly enough, for example a ], it can be possible for an event horizon to exist. | ||
| The '''event horizon''' is distinct from the ] . | The '''event horizon''' is distinct from the ] . | ||
Revision as of 16:08, 7 October 2003
The event horizon is a boundary beyond which information will never reach an observer at a given location in space-time. An event horizon is a mathematical construct and not a physical object and a person passing through an event horizon will not notice any
odd behavior. From an outside observer however, an object passing though an event horizon will appear redder and dimmer and will appear to freeze at the moment the object passes the event horizon.
An event horizon can form around a gravitational singularity where its gravitational pull exceeds the ability of any form of mass or energy, including light, to escape. Outside the event horizon, there is a region where light is bent because of the gravitational pull. However it has been demonstrated that a naked singularity where a gravitational singularity exists without an event horizon is possible.
Hypothetically, an event horizon can also exist in a universe, for an observer at a given location in space-time. When a universe expands quickly enough, for example a de Sitter universe, it can be possible for an event horizon to exist.
The event horizon is distinct from the particle horizon .
See also gravity, general relativity, black hole, gravitational singularity, particle horizon and quantum physics.
Other uses of this term: Event Horizon, a science fiction film