big bang
US /ˈbɪɡ ˈbæŋ/
UK /ˈbɪɡ ˈbæŋ/
1.
the rapid expansion of matter from a state of extremely high density and temperature that according to current cosmological theories marked the origin of the universe
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The Big Bang theory explains the origin of the universe.
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Scientists continue to gather evidence supporting the Big Bang model.