The phrase "hub of the universe" is often used to describe a location that is of great importance or significance. However, there are several synonyms that can be used to convey a similar sentiment. For instance, "center of the world" and "heart of the city" both suggest that a particular place is at the core of something significant. Meanwhile, "nerve center" and "command post" imply that a location is vital for the coordination and control of certain operations. Other synonyms for "hub of the universe" include "capital", "pivot", and "epicenter." Regardless of the term used, the implication is that the place described is essential to the functioning of some larger entity.