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c. 13.7 billion years ago
 
Narrative history in HistoryWorld     
Big Bang, an unimaginably large explosion from an unimaginably small particle - according to modern theory the first moment of the universe       
c. 13.7 billion years ago
 
Narrative history in HistoryWorld     
Hydrogen and helium nuclei form in the first three minutes, with perhaps another 300,000 years before they combine with electrons to form atoms