The concept of the "non-observable universe" can be a bit confusing, so let me explain it in more detail.
The observable universe is the portion of the universe that we can see or detect with our current technology. It is limited by the distance that light has had time to travel since the Big Bang, which is estimated to be about 13.8 billion light-years.
Beyond the observable universe, there may be more universe that is currently beyond our reach. This is often referred to as the "non-observable universe" or the "unobservable universe." The size of the non-observable universe is not precisely known because we cannot directly observe or measure it.
There are several theories and models about the overall structure and size of the universe. One such model is the concept of cosmic inflation, which suggests that the universe underwent a rapid expansion in the early moments after the Big Bang. According to this theory, regions that are now beyond our observable universe may have expanded faster than the speed of light, effectively moving them outside of our reach.
It's important to note that the non-observable universe is a theoretical concept based on our current understanding of physics and cosmology. The exact size and properties of the non-observable universe remain uncertain and the subject of ongoing research and exploration.