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===Cosmology=== {{further|Physical cosmology|Cosmic time|Chronology of the universe}} In [[physical cosmology]], the present time in the [[chronology of the universe]] is estimated at 13.8 billion years after the [[Big Bang|singularity]] determining the [[arrow of time]]. In terms of the [[Expansion of the universe#Expansion history|cosmic expansion history]], it is in the [[dark-energy-dominated era]], after the universe's matter content has become diluted enough for [[dark energy]] to dominate the total energy density. It is also in the universe's [[Stelliferous Era]], after enough time for [[supercluster]]s to have formed (at about 5 billion years), but before the [[accelerating expansion of the universe]] has removed the local supercluster beyond the [[cosmological horizon]] (at about 150 billion years).<ref>{{cite journal |last1 = Krauss |first1 = Lawrence M. |author-link1=Lawrence Krauss |last2 = Starkman |first2 = Glenn D. |year = 2000 |title = Life, the Universe, and Nothing: Life and Death in an Ever-expanding Universe |journal = Astrophysical Journal |volume = 531 |issue = 1 |pages = 22β30 |doi = 10.1086/308434 |bibcode = 2000ApJ...531...22K |arxiv = astro-ph/9902189 |s2cid = 18442980 }}</ref>
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