The non-observable part of the universe refers to the portion of the universe that is beyond our current observational capabilities. The observable universe is the region of the universe that we can potentially detect and observe given the finite speed of light and the age of the universe.
The observable universe has a radius of approximately 46.5 billion light-years, which corresponds to the distance that light has had time to travel since the Big Bang. However, this does not mean that the universe ends or is only 46.5 billion light-years in size. The universe is thought to be much larger than the observable universe, but due to the expansion of space and the finite speed of light, there are regions that are beyond our observational reach.
The exact size of the non-observable part of the universe is uncertain and can't be determined with our current knowledge. Cosmological models suggest that the universe is likely infinite in size or significantly larger than the observable universe. However, without direct observations or evidence from beyond the observable universe, it remains a topic of ongoing scientific investigation and speculation.