The concept of the "edge" of the observable universe is a bit nuanced. The observable universe refers to the portion of the universe that we can currently observe or detect. It is limited by the distance that light has had the opportunity to travel since the Big Bang, given the age of the universe and the finite speed of light.
The current estimate for the age of the universe is around 13.8 billion years, which means we can observe objects that are up to 13.8 billion light-years away from us. However, due to the expansion of the universe, those objects have moved even farther away from us since the light we detect was emitted. As a result, the currently observable universe is estimated to have a diameter of about 93 billion light-years.
Now, when we talk about what lies beyond the observable universe, it is important to note that we do not have direct observational access to those regions. This is because light from those regions has not had sufficient time to reach us since the Big Bang. Therefore, the exact nature of what lies beyond the observable universe is unknown to us.
However, based on our understanding of the expansion of the universe, it is widely believed that the universe is much larger than the observable universe. The observable universe is just a tiny fraction of the entire universe, and it is thought to continue beyond what we can observe. The current leading cosmological models, such as the inflationary Big Bang model, suggest that the universe is infinite or at least significantly larger than the observable universe.
It's important to recognize that our understanding of the universe is continually evolving, and scientists are actively exploring various theories and observations to gain more insights into its size, shape, and overall structure.