Stanford: "Objects in spacetime all move at constant speed $c$." Are they right?
31825
Why are objects at rest in motion through spacetime at the speed of light?
76819
How does "warp drive" not violate Special Relativity causality constraints?
150022
If an object is large enough and slow enough is there a point that we can say we know its position and momentum?
82624
"Newtonian limit" property of special relativity
80207
Are moving objects producing stronger gravity fields?
35663
Is there a formula that gives the position of an object depending on the time, but which doesn't allow the object to surpass the speed of light?
47568
Is it experimentally proven that photons travel at speed $c$ in vacuum?
60751
General relativity and the conservation of momentum
10209
How to show the spacetime interval is invariant in general?
137834
Distance in relativistic circular motion in invariant spacetime
26363
How does faster than light travel violate causality?
46050
How to describe arbitrary accelerations in special relativity
148838
Is the total mass of the universe constant in time?
116728
Why does speed of light have to be constant?
139987
Special Relativity, 2nd Postulate -- Why?
67440
What does the statement "the laws of physics are invariant" mean?
90464
Is Einstein's Special Relativity completely inclusive of Newton's 3 laws of motion?