Yes, the grand Universe have such a centre of gravity, it is called eternity or Paradise and around this centre rotates the centraluniverse and surrounding this centraluniverse is the 7 superuniverses of time and space and outside this huge circuit are the outer space levels.
The universe of universes is a creation and not a big bang, an accident. There has never been a sound, an explosion or a singularity, which suddenly, unexpected and randomly began expansion into uncharted space. The Universe of universes are a constructed perfect functionality of divine origin.
For further insight, i suggest one read the Urantia Book.