Is the Universe an open or closed system?
The oracle of making a statement on the extent and bounds is hidden in the Holistic Who;e of voids, galaxies, clusters and super clusters.
It is a good redeeming that the researchers are on the threshold of determining the leaps and bounds of observable universe, to the extent of mapping our universe..
Yet, it appears that we have to fix the dimensions of universe as 5, or perhaps greater up to 11, and after consensus, discuss the possibility of universe existing as a closed system. Until then, it is open.