Was energy created in the big bang, or did the single point contain all of the energy? - Quora
Energy and the Big Bang
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How fast did the universe expand before the dark-energy-dominated era that started roughly 4 billion years ago? : r/cosmology
Dark energy could lead to further Big Bangs, research suggests
Evidence for Big Bang Cosmology
The Origin of the Universe and the Big Bang Theory
big bang - Kids, Britannica Kids
How much energy was released when the big bang happened? - Quora