Space in [x,y,z], spacetime is [x,y,z;t]. It's math. Space represents the physical object, which is currently named as "physical vacuum" (literally "physical em

Space in [x,y,z], spacetime is [x,y,z;t]. It's math. Space represents the physical object, which is currently named as "physical vacuum" (literally "physical emptiness", where "physical" means that emptiness is not empty). It's hard to say what is represented by spacetime in math models.