Universe began with Big Bang from "summary" of A Brief History of Time by Stephen W. Hawking
According to the Big Bang theory, the universe began as a singularity – a point of infinite density and temperature – about 13.8 billion years ago. At this moment, all the matter and energy in the universe was concentrated at a single point, with gravity so strong that not even light could escape. This singularity then began to expand rapidly, creating space and time as it did so. As the universe expanded, it cooled down and matter began to form. This matter eventually coalesced into galaxies, stars, and planets, creating the vast cosmos that we see today. The expansion of the universe is still ongoing, with galaxies moving away from each other at incredible speeds. The Big Bang theory is supported by a wealth of observational evidence, such as the cosmic ...
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