The Big Bang is the prevailing cosmological model that describes the early stages of the universe's evolution. According to this model, the Big Bang did not occur within the currently observable universe as we understand it.
The observable universe refers to the portion of the entire universe that we can potentially observe from our vantage point on Earth. It is limited by the distance that light has had the opportunity to travel since the beginning of the universe. The current estimate for the radius of the observable universe is about 46.5 billion light-years.
However, the Big Bang itself is believed to have initiated the expansion of space and time. It is often visualized as an event that occurred everywhere in the universe simultaneously, with space itself rapidly expanding from an extremely dense and hot state. The expansion of space during the Big Bang is what led to the current large-scale structure of the universe.
Since the observable universe is limited by the speed of light and the finite age of the universe, we can only observe a portion of the entire universe. The exact size and nature of the universe beyond the observable region are still topics of active scientific investigation and speculation. It is possible that the universe extends far beyond what we can currently observe, and the full extent of the Big Bang's effects may be much larger than the observable universe.