The most popular theory of our universe's origin centers on a cosmic cataclysm unmatched in all of history—the big bang.
The most popular theory of our universe's origin centers on a cosmic cataclysm unmatched in all of history—the big bang.The best-supported theory of our universe's origin centers on an event known as the big bang. This theory was born of the observation that otherare moving away from our own at great speed in all directions, as if they had all been propelled by an ancient explosive force.
It's also thought that the extremely close quarters allowed the universe's very first particles to mix, mingle, and settle into roughly the same temperature. Then, in an unimaginably small fraction of a second, all that matter and energy expanded outward more or less evenly, with tiny variations provided by fluctuations on the quantum scale. That model of breakneck expansion, called inflation, may explain why the universe has such an even temperature and distribution of matter.
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