In trying to answer such questions, scientists bump up against the limits of the laws of physics. Existing theories can account for the evolution of the universe from its earliest moments — from a fraction of a second after the Big Bang — but the question of what came before has been among the most vexing in all of science.
“It’s my life’s work to try to answer that question,” University of Toronto physicist Renée Hložek says.
This image represents the evolution of the universe, starting with the Big Bang. The red arrow marks the flow of time.
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