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Universe before the Big Bang, conceptual illustration
Conceptual illustration representing the compact atoms of the universe before the Big Bang. The term Big Bang describes the initial expansion of all atoms in the universe from an infinitely compact state 13.7 billion years ago. The initial conditions are not known, but less than a second after the beginning temperatures were trillions of degrees Celsius and the primordial universe was smaller than an atom. The universe has been expanding and cooling ever since., by DETLEV VAN RAVENSWAAY/SCIENCE PHOTO LIBRARY
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