There is no end to the physical universe it goes on forever. It must go on forever because if it had an end there would be something beyond that end and mankind would do all he could to get beyond that something. And if there is something beyond that end then there is no "end" only a barrier to something else. Barriers, if they exist, will not exist forever. In the physical world there is always "something" beyond a seeming barrier. So we will always be exploring and learning and breaking barriers wherever they may be found. This is what mankind has always done.
God like the endless physical universe also exists in an eternal state.
There was a time when mankind understood the material world around him only through his very limited senses. His eyes could only see the surface of things. Today he has instruments which see much deeper, much farther than his physical eye. As well as instruments that "hear" beyond the capability of our physical ears. We want to know, we want to explore. We are seekers of knowledge. The stars have always beckoned to us, the oceans have said, "cross over". This is how we are.
There have been in the past men who "crossed over" not a physical ocean but the ocean that separates man from God. They crossed over because they were being beckoned to cross over and with God's help they did cross over. They crossed over, picked up something good from the opposite shore, and returned to share it with others. Later others made the same trip and came back bearing something good to their shore.
Many today, though, stand on the shore crying out: Not enough. Not enough. Give us more or we will not believe! Give us more!
The opposite shore answers with: Be careful what you ask for. Are you ready to see the truth you seek? Are you not already quite comfortable in your disbelief?
But this is just a story and should not be considered anything more than that.