[[Theoretical physics|Theoretical]] and [[Physical cosmology|observational cosmologists]] vary in their usage of the term ''the Universe'' to mean either this whole system or just a part of this system.[http://links.jstor.org/sici?sici=0022-5037] JSTOR: One Universe or Many?] | [[Theoretical physics|Theoretical]] and [[Physical cosmology|observational cosmologists]] vary in their usage of the term ''the Universe'' to mean either this whole system or just a part of this system.[http://links.jstor.org/sici?sici=0022-5037] JSTOR: One Universe or Many?] |