The non-observable universe, also known as the unobservable universe or the cosmic event horizon, refers to the portion of the universe that is currently beyond our ability to observe due to the limitations of the speed of light and the expansion of the universe.
The size of the non-observable universe is difficult to determine precisely. It depends on factors such as the age of the universe, the rate of expansion, and the geometry of space. However, we can make some estimates based on our current understanding of cosmology.
The observable universe, which is the portion of the universe we can observe, is commonly estimated to have a radius of about 46.5 billion light-years. This value takes into account the expansion of the universe since the Big Bang.
The non-observable universe extends beyond the observable universe, and its size depends on the rate of expansion. If the expansion of the universe continues at its current rate, there will be regions that are currently beyond our observational reach. The current best estimate suggests that the non-observable universe could be significantly larger than the observable universe, possibly infinite in size.
It's important to note that the non-observable universe is not directly accessible to us, as light from those regions has not had enough time to reach us since the Big Bang. Therefore, our knowledge about the non-observable universe is limited, and our understanding of its precise size and properties remains speculative.