Cosmic Horizon

Heard in 2 episodes across 2 shows since Jul 2026

A cosmic or cosmological horizon is a measure of the distance from which one could retrieve information, defining a boundary in three-dimensional space. It typically refers to either the particle horizon, which marks the boundary of the observable universe based on light that has had time to reach us since the Big Bang, or the cosmic event horizon, which defines the limit of events that can ever be observed in the future.