Now unfreeze it. In the next 1 second frame the light from the big bang has now occupied a new region of empty space while it traveled outward. Or did it create a new region of space? How would the light "create" a new region of space and what did it create that new space in? Thats why I would say you can have empty space, because it seems a lot more logical to say light travel to a new region of empty space than saying light created new space. What does light create new space in? space?