Do you think there is a little white fence with "The Edge of Space" written on it forming a nice little boundary so that we can put a number like 93 billion to it? Do we really think that space just stops? What is there a mile further away, or a billion miles, or 100 billion miles? Personally, I can't see how there could be a limit... Why do people struggle with the idea of infinity?
(I do have some background here - both my parents were astronomers and I grew up with black holes being discussed over dinner. No formal education, but much philosohpical stimulation...)