cosmological horizon

English

Noun

cosmological horizon (plural cosmological horizons)

1. (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

• Hubble horizon
• particle horizon
• comoving horizon
• cosmic light horizon
• cosmic event horizon
• cosmological event horizon