According to our current understanding of the universe, the observable universe is believed to have a radius of about 46.5 billion light-years. However, it is important to note that the universe itself is likely much larger than the observable universe.
The observable universe refers to the portion of the universe that we can see from Earth, given the limitations imposed by the finite speed of light and the age of the universe. Since the universe is estimated to be about 13.8 billion years old, we can only observe objects that are within a distance that light could have traveled since the Big Bang.
As for what lies at the very edge of the observable universe, it's a bit more complicated. The universe doesn't have a distinct edge in the traditional sense. Instead, the observable universe represents the farthest extent to which light has had the opportunity to reach us since the beginning of the universe.
Beyond the observable universe, there could be more regions of space-time that are currently beyond our ability to observe due to the limitations imposed by the speed of light. These regions are often referred to as the unobservable or invisible universe. However, it's important to note that our understanding of what lies beyond the observable universe is still a topic of active research and speculation.