The Big Bang Theory Space question and tv show question?

Big bang theory means the start of the expansion of the universe from a single point which we still don't know today just how big or small it may have been, nor have we figured out what came before the big bang. But we'll figure it out one day.

The Big Bang Theory is a model of the universe that describes its expansion from a singularity at its temporal origin point approximately 13.73 billion years ago. The singularity can be referred to as a variety of things: Time Zero, the First Cause, the universe's initial state, the mathematical limit of the timeline, etc. It represents the durationless point at which the universe possessed a spatial size of zero, and all energy in the universe was compressed into this volume. The Big Bang Theory explains the events that occurred, beginning at Time Zero through to today.