In response to the original question a good few years ago "Where Does Space End? It Must End Somewhere! "
This question is used by people wanting to quantify their existance and have a meaning, the truth behind it is we are are miniscual compared to our galaxy of which it is one of 200 billion plus. People talk about whats at the end of our universe, say a vacuum of a sort or just empty space..whos to say that are universe isnt the equivalent of 1 galaxy in our universe! if anything this is alot more likely, and so you say what about at the end of that..pheraps its like looking into a mirror with a mirror behind you..never ending ! pheraps its circular, dimensions, pheraps what is at the end is too incomprehensible for a race that is still very much primitive in our intellectual capacity !
This is the true way too look at things, but it can be hard for educated people to admit they have no real significance and so you come full circle to the statement "this question is used by people wanting to quantify their existance and have a meaning".