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Event horizon - Wikipedia, the free encyclopedia (1556 words) |
 | An example of a cosmological model with an event horizon is a universe dominated by the cosmological constant (a de Sitter universe). |
| For the case of a horizon perceived by an occupant of a de Sitter universe, the horizon always appears to be a fixed distance away for a non-accelerating observer. |
| For the case of the horizon around a fl hole, observers stationary with respect to a distant object will all agree on where the horizon is. While this seems to allow an observer lowered towards the hole on a rope to contact the horizon, in practice this cannot be done. |
| Particle horizon - Wikipedia, the free encyclopedia (124 words) |
| The particle horizon in physical cosmology is the maximum distance from which particles (of positive or zero mass) can have travelled to the observer in the age of the universe. |
| The particle horizon is defined as the largest comoving distance from which light can have reached the observer — at the present moment. |
| The event horizon is defined as the largest comoving distance from which light can ever reach the observer — at any time in the future. |
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