With respect to what we are saying space is homogeneous or space-time is isotropic?
73937
What is meant when it is said that the universe is homogeneous and isotropic?
1553
How is gravity proportional to space-time curvature in the rubber-sheet analogy?
1537
Is a photon "fixed in spacetime"?
43724
What do spacelike, timelike and lightlike spacetime interval really mean?
30041
What is "special" and what is "general" in Relativity?
115190
Why is physical space equivalent to $\mathbb{R}^3$?
158909
Importance of the homogeneity assumption in definition of linear map
43976
Is the description of the gravitational field as a vector field and a tensor field compatible?
20698
What's the difference between space and time?
148739
"Anachronism" is to "time" as what is to "space"?
144208
Does String theory say that spacetime is not fundamental but should be considered an emergent phenomenon?
95681
If the universe is 3D, how is space-time like a "fabric"?
23359
Does the Planck scale imply that spacetime is discrete?
122357
Discreteness of Spacetime and Violation of Lorentz symmetry
18982
Does Quantum Mechanics assume space and time are continuous?
60084
In a very small static universe with only a particle, does it make sense to talk about time?
70254
What is a homogeneous Differential Equation?