cosmological horizon

== English == === Noun === cosmological horizon (plural cosmological horizons) (astronomy) The distance from an observer in a universe beyond which it is impossible for the observer to see, as the light (or other luminal particles) cannot have travelled that distance over the current age of that universe. ==== Usage notes ==== Typically the cosmological horizon refers to the cosmological horizon of an observer on Earth. ==== Synonyms ==== ==== Translations ==== ==== Further reading ==== cosmological horizon on Wikipedia.Wikipedia