Can relative speeds be greater than the speed of light?
12267
(Almost) double light speed
115239
Is the Speed of Light an universal spacetime constant, the velocity of electromagnetic waves, or of photons?
90740
Ping faster than light
56005
Speed of light travel
56065
How can the speed of light be a dimensionless constant?
55971
Why does the (relativistic) mass of an object increase when its speed approaches that of light?
4350
Rotate a long bar in space and get close to (or even beyond) the speed of light $c$
103827
Does magnetic propagation follow the speed of light?
820
Photons are faster than the speed of light because they travel in transversal waves?
142906
How can a particle in a medium ever travel faster than light?
128320
In superluminal phase velocities, what is it that is traveling faster than light?
124330
Can an observer B move in such a way that his clock will run faster than that of a fixed observer A?
14922
Do tachyons move faster than light?
47568
Is it experimentally proven that photons travel at speed $c$ in vacuum?
91265
Has the speed of light changed over time?
56031
Quantum entanglement faster than speed of light?
115786
Speed of gravitational waves and light