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Reference.org
Timeline of the universe
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<p>The timeline of the universe begins with the <a href="/facts/Big_Bang/I5T1vTnv">Big Bang</a>, 13.799 ± 0.021 billion years ago, and follows the formation and subsequent evolution of the <a href="/facts/Universe/XbfpnDmM">Universe</a> up to the present day. Each <i><a href="/facts/Era/3H0fTQrK">era</a></i> or <i><a href="/facts/Periodization/V5HBpupn">age</a></i> of the universe begins with an "<a href="/facts/Epoch/ow9RnUFC">epoch</a>", a time of significant change. Times on this list are relative to the moment of the Big Bang. </p>