Multiple complete systems containing all existing matter, energy, and space; in plural, often used to describe different possible realities or fictional worlds.
From Latin 'universus' meaning 'turned into one, whole,' combining 'uni-' (one) and 'versus' (turned). The concept evolved from describing the single cosmos to modern physics allowing for multiple possible universes.
The idea of multiple universes went from pure philosophy to serious science! Physicists now think the Big Bang might have created countless universes with different physical laws—some might even have different versions of you in them.
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