The Big Bang Theory explains which of the following?

The Big Bang Theory is a widely accepted scientific model describing the origin and evolution of the universe. It posits that approximately 20 billion years ago, the universe began as a hot, dense singularity, infinitely small and containing all matter, energy, space, and time. This singularity underwent rapid expansion, leading to the formation of subatomic particles within microseconds. As the universe cooled, these particles coalesced to form atoms, eventually enabling the emergence of stars, galaxies, and other celestial structures over billions of years.