"Space" and "the physical universe" are related but distinct concepts.
In everyday language and general understanding, "space" typically refers to the vast expanse that encompasses all celestial bodies, such as stars, planets, galaxies, and other cosmic entities. It represents the three-dimensional extent in which these objects exist and interact. Space is often described as the "empty" or "void" region that provides a backdrop for the existence of matter and energy. It is the arena in which the physical universe exists.
On the other hand, the "physical universe" refers to the entirety of all matter, energy, and the laws that govern them. It encompasses not only the celestial bodies but also the particles, fields, forces, and all observable and unobservable phenomena in the cosmos. The physical universe includes everything that can be studied and analyzed through scientific methods and observations.
In essence, space can be seen as the "container" or the "stage" in which the physical universe operates. The physical universe, on the other hand, encompasses all the entities, structures, and phenomena that exist within that space.
It's worth noting that these concepts can have different interpretations depending on the context. In scientific or cosmological discussions, they may be defined more precisely and can involve mathematical and theoretical frameworks to describe the nature and properties of space and the physical universe.