Universe began with Big Bang from "summary" of A Short History of Nearly Everything: Special Illustrated Edition by Bill Bryson
The notion that everything began with a Big Bang is both extraordinary and surprisingly straightforward. Imagine - in the beginning, all the matter and energy that now populate the universe originated from a single point of infinite density. It is difficult to conceive of such a concept, but this is the prevailing theory that scientists have arrived at after years of observation and research. According to this theory, the universe - in all its vastness and complexity - began as a singularity, a point of unimaginable density and temperature. From this singularity, about 13.8 billion years ago, the universe began to expand rapidly, in an event we now refer to as the Big Bang. This expansion continues to this day, shaping the universe as we know it. In the first few moments after the Big Bang, the universe was a seething, super-hot soup of particles and radiation...
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