The timeline of the early universe outlines the formation and subsequent evolution of the Universe from the Big Bang (13.799 ± 0.021 billion years ago) to the present day. An epoch is a moment in time from which nature or situations change to such a degree that it marks the beginning of a new era or age. Times on this list are measured from the moment of the Big Bang.

The first 20 minutes

Planck epoch

Grand unification epoch

Electroweak epoch

Quark epoch

Hadron epoch

Lepton epoch

Photon epoch

Matter era

Matter and radiation equivalence

Cosmic Dark Age

Galaxy epoch

Acceleration

Epochs of the formation of the Solar System

Recent history