The Big Bang is the leading scientific explanation for the origin of the universe. It suggests that around 13.8 billion years ago, the universe began as an extremely hot and dense point, which then expanded rapidly. This expansion led to the formation of all matter, energy, and the fundamental forces of nature. As the universe continued to expand and cool, particles began to form, eventually leading to the creation of atoms. Over time, these atoms grouped together to form stars, galaxies, and other cosmic structures. The Big Bang theory is supported by various observations, including the cosmic microwave background radiation and the redshift of distant galaxies.