The Big Bang marked the beginning of our universe from "summary" of La vita del cosmo by Lee Smolin
The Big Bang is the moment that gave birth to our universe. It was not an explosion in space, but rather the moment when space itself began to expand from a hot, dense state. This expansion continues to this day, carrying galaxies away from each other at an ever-increasing rate. At the beginning, the universe was incredibly hot and dense, filled with a sea of particles and radiation. As it expanded and cooled, these particles began to clump together due to gravity, eventually forming the galaxies, stars, and planets that we see today. The Big Bang theory is supported by a wealth of observational evidence, such as the cosmic microwave background radiation, which is a faint glow left over from the early universe. This radiation is nearly uniform in all directions, indicating that the universe was once much smaller and hotter than it is now. Furthermo...
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