Rebuttals for variable speed of light?
91265
Has the speed of light changed over time?
33110
The origin of the value of speed of light in vacuum
139987
Special Relativity, 2nd Postulate -- Why?
15685
Does slowing light violate relativity?
37421
Can a shadow move faster than the speed of light?
27820
What's wrong with this experiment showing that either FTL communication is possible or complementarity doesn't hold?
61714
Can One-Way Speed of Light be Instantaneous?
115572
Theoretical proof of the constant of speed of light $c$ in vacuum in all frames of references
4350
Rotate a long bar in space and get close to (or even beyond) the speed of light $c$
77372
"Speed" of Gravity and Speed of Light
13786
A question in Special Relativity
127383
Speed of light in general relativity
146489
What does Lijun Wang's experiment about supraluminal speed of light in a medium mean?
4005
If refraction slows down light, isn't it possible to hold light still?
4132
What is the closest general-relativistic equivalent of a "time slice"?
974
Speed of light in a gravitational field?
80291
Relativistic velocity addition from time dilation