Tachyons and Speed of light
14922
Do tachyons move faster than light?
83672
Time dilation in a gravitational field and the equivalence principle
62039
What does a sphere moving close to the speed of light look like?
31825
Why are objects at rest in motion through spacetime at the speed of light?
57773
About the speed of light and gravity
2754
Why and how is the speed of light in vacuum constant, i.e., independent of reference frame?
93598
Is it proven experimentally that the speed of causality (light) is the maximum speed?
37973
Space-time in String Theory
52952
Why do blaster bolts move slower than the speed of light?
4132
What is the closest general-relativistic equivalent of a "time slice"?
115786
Speed of gravitational waves and light
4350
Rotate a long bar in space and get close to (or even beyond) the speed of light $c$
19850
Why is the speed of light defined as 299792458 m/s?
17152
Do all massless particles (e.g. photon, graviton, gluon) necessarily have the same speed $c$?
88879
Time dilation as an observer in special relativity
13786
A question in Special Relativity
46510
Relativity and Galaxy Rotation Speed