If light travels along null-like geodesics, does that mean it remains at the same point on a spacetime manifold?
135108
Why doesn't $ds^2 = 0$ imply two distinct points $p$ and $p'$ on a manifold are the same point?
72913
Why does a light wave fade as it travels through space?
22118
If all motion is relative, how does light have a finite speed?
149084
Black Hole Photon Sphere
103827
Does magnetic propagation follow the speed of light?
127383
Speed of light in general relativity
17858
What is the physical meaning of the affine parameter for null geodesic?
145003
How can a point-like particle "feel" gravity, if locally the curvature of spacetime is always flat?
43724
What do spacelike, timelike and lightlike spacetime interval really mean?
141546
Time and distance in a photon's frame of reference
45888
Minkowski metric -- why does it follow from the constancy of the speed of light?
5966
Is a black hole singularity a single point?
37941
Can light travel slower than the maximum?
57070
Dimensionality of null space when Trace is Zero
35883
Why do objects follow geodesics in spacetime?
118815
What makes matter travel along geodesics?
151086
What bends fabric of space-time?