KnowraPlanck epochLinked fromLinked fromThe 9 pages that link to Planck epoch, each with the reason it gives.All 9Broader topic 3Related 5Narrower topic 1Big BangBroader topic: Known physical theories do not yet provide a tested account of this boundary of Big Bang cosmology.Max PlanckRelated: Its name invokes Planck’s constant, which sets the scale where quantum gravity becomes relevant.Planck unitsBroader topic: Its defining timescale is expressed directly by the Planck time.Quark epochRelated: It precedes the eras in which the quark plasma is described by established particle physics.Lepton epochRelated: It lies far earlier than the particle-physics eras that include lepton dominance.Chronology of the universeBroader topic: It marks the limit of current physical theories near the timeline’s beginning.Photon epochNarrower topic: It represents a far earlier stage than the photon-dominated universe.Grand unification epochRelated: It precedes grand unification and marks the higher-energy boundary of established cosmological descriptions.Hadron eraRelated: It marks a much earlier regime than the particle-physics epochs that include hadron formation.