Hubble volume

== English == === Noun === Hubble volume (plural Hubble volumes) (cosmology) The spherical region of the observable universe surrounding an observer beyond which objects recede from that observer at a rate greater than the speed of light due to the expansion of the Universe. ==== Synonyms ==== Hubble sphere subluminal sphere causal sphere sphere of causality ==== Translations ==== ==== See also ==== cosmological horizon Hubble limit