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Chronology of the universe
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<p>The chronology of the universe describes the history and <a href="/facts/Future_of_an_expanding_universe/ySer1Ltq">future of the universe</a> according to <a href="/facts/Big_Bang/I5T1vTnv">Big Bang</a> cosmology. </p><p>Research published in 2015 estimates the earliest stages of the universe's existence as taking place 13.8 <a href="/facts/Billion_years/KrcuDaHm">billion years</a> ago, with an <a href="/facts/Confidence_interval/NS8mG5UE">uncertainty</a> of around 21 million years at the 68% confidence level. </p>