Why did the Big Bang occur?

An alternative theory is the multiverse theory, in which separate universes constantly expand and then contract into singularities.

Naturally, there is no way to solve these theories.

The universe came into being as a singularity, a very hot and dense state, approximately 13.8 billion years ago, and it quickly expanded from there to form the universe as we know it. Scientists are still debating what exactly caused or triggered the Big Bang.

The Big Bang occurred approximately 13.8 billion years ago due to a rapid expansion of hot, dense matter and energy from a singularity. This expansion led to the formation of the universe as we know it. The exact cause or trigger of the Big Bang remains a subject of theoretical speculation, as our current understanding of physics breaks down at the moment of singularity.