Cosmological horizon

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

A cosmological horizon is one of two boundaries in three dimensional space, the particle horizon or the event horizon. The particle horizon divides space into points from which light has had enough time to reach an observer, and points that are too distant for their light to have reached the observer.

Excerpt from the Wikipedia article “Cosmological horizon”, under the CC BY-SA 4.0 license. Read the article on Wikipedia