How can space itself "move/expand" Frequently in cosmology and sometimes in other fields you hear talk of the universe expanding of contracting. I think we finally settled on that it is expanding. I'm having a little trouble grasping that - space itself/the geometry of space is changing with time. I unfortunately lack the math background to understand any talk of manifolds and tensors(not for lack of trying), but conceptually, can someone help me get my head around that. How does can the geometry of space change? What does that even mean to have "space" expand? What are the implications of this changing nature of space? If the explanation involves math, I'm working on Calc III this semester, and have a fairly good grasp of "normal" Real-3 space from other sources.