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Millennium Run
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<p>The Millennium Run, or Millennium Simulation (referring to its size) is a <a href="/facts/Computer/SQe1aK05">computer</a> <a href="/facts/N-body_simulation/xrHwX7j3">N-body simulation</a> used to investigate how the distribution of matter in the <a href="/facts/Universe/XbfpnDmM">Universe</a> has evolved over time, in particular, how the observed population of galaxies was formed. It is used by <a href="/facts/Scientists/JDvthEFM">scientists</a> working in <a href="/facts/Physical_cosmology/ww4ChbEq">physical cosmology</a> to compare <a href="/facts/Scientific_method/182j8RWE">observations with theoretical predictions</a>. </p>