First of all, lets consider that this question is asked before neutrino's speed was discovered. " Lets consider a rod, a rod which is as long as 1 light year. Consider that it is a rigid rod of steel with diameter 1m (to prevent bending) I gave a nudge to it from one side, then the whole rod will displace, right? For example, i pushed the rod by 1m, then the rod will move 1m, right? Ohh, look what happened! Something went faster than light! A lot faster! " If you didnt get the above case, ill explain what happened: I used the rod to send a 'message' by pushing and pulling it. Hence, it traveled faster the speed of light, since it conveyed the message through 1 light year almost instantly. If you disagree with the above, give approximations of the speed of the message, if its not faster than 'c'.