The Big Bang theory explains the origin of the universe as a rapid expansion from an extremely hot and dense state approximately 13.8 billion years ago. Initially, the universe was a singularity, which then expanded and cooled, allowing for the formation of fundamental particles and, eventually, atoms. Over billions of years, gravitational forces caused these atoms to clump together, forming stars, galaxies, and larger cosmic structures. The ongoing expansion, observed today, reflects the dynamic evolution of the universe from its initial state to the complex cosmos we see now.
in three to five sentences brifly describe how big the big bang theory explains the origin and evelution of the universe
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