re. "A wobbly mass of gooey fluid" would have a well-defined edge to it."
maybe I should have said; visualise an INFINITE wobbly mass of gooey fluid...
dear janitor, wether the universe is infinite or not (wether it has an edge or not) is always hard to imagine, my theory leaves that issue wide open, I suspect we will never know what lies beyond the universe and we cannot imagine infinity so its not really worth worrying about.
to clarify...
visualize a model of the whole universe as a wobbly mass of gooey fluid,
like a very loose jelly in zero gravity. A model of the universe with these
characteristics of a liquid would allow for the perception over time of
accelerated expansion within OUR time horizon.
therefore that...