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  Not Ranked : +0 / -0 0 score RE:Mass not a limiting factor
Relativity theory have very far reaching consequences, one of them is the non-existence of perfect rigid bodies.
The limit in the velocity in relativity theory is closely related to causality principle (a cause always come before ITS consequence). Causality is a VERY experimental principle and velocities of transmission of information higher than the speed of light could break up causality.
Indeed, bodies are made up of atoms. When you push a bar of some material the atoms push one another in sequence. For little bodies you would not note this, but for a large body, the deformation becomes a compression-expansion wave that propagates at approximately the speed of sound of the material. So, you would not communicate instantaneously, but instead of it, this would be a very slow transmission. | 
