And to answer the questions you edited in, yes, there is an edge to the universe. It is the literal edge of time, the moment when everything was one and infinite (a singularity, we think). This edge is 13.8 billion light years in every direction. As we look far away and back in time, we can see the whole history of everything, from just after the universe cooled and expanded enough to be transparent to light, to the first protogalaxies and all the development of everything up until our very noses.