[Lokibob]

Nothing in the theory of relativity is a constant, it is all relative to the observer. Not time, speed, distance, energy, mass, or speed of light. Speed is a measure of time vs. distance, and if time is relative or distance is relative, than the speed of light has got to be relative.

.....Bob

[FredZarguna]

Not true. In fact, not even close.

There are two postulates of Special Relativity:

1. All inertial reference frames are equivalent; consequently absolute uniform motion cannot be detected.
2. The speed of light is a constant which is the same for all inertial observers.

[stripes1776]

Nothing in the theory of relativity is a constant, it is all relative to the observer. Not time, speed, distance, energy, mass, or speed of light. Speed is a measure of time vs. distance, and if time is relative or distance is relative, than the speed of light has got to be relative.

That isn't exactly what relativity theory says. Einstein's first choice to name his theory was invariance theory. I have often regretted that he didn't keep the first name. That might have cleared up some misconceptions. Perhaps his theory is incorrect, but it would be important to represent his theory accurately.

[allmost]

The constants are relative. The Lorentz contraction being infinite shows the limitations immediately.