Please excuse my lack of proper terminology, I've only just graduated high school so I'm by no means an expert on anything regarding physics. My question is this: since there is a natural limit to the velocity of an object, the speed of light, and temperature is measured by kinetic energy of molecules of a substance, does that mean that the speed of light imposes a limit on how fast the molecules can move, and thus imposes a limit on the temperature? I'm not looking at it from a relativistic point of view, and I haven't really considered any of the consequences of the molecules approaching the speed of light, is this perhaps more important than I suspected? On a semi-related note, is absolute zero a limit on the other end of the temperature spectrum? The way I see it, if all particle motion stops, this violates the uncertainty principle. So absolute zero cannot be reached, correct?