Yes, the Big Bang theory is the prevailing cosmological model for the observable universe's earliest known periods. It suggests that the universe was once in an extremely hot and dense state and has been expanding ever since. The theory is supported by multiple lines of evidence, including the cosmic microwave background radiation and the observed redshift of galaxies moving away from each other. While the exact details of the Big Bang are still being researched and refined, the overall concept has strong support in the scientific community.
