And how do you measure the length of a burning rod (that's moving past by you at a considerate speed) in the face of relativity of simultaneity? I guess it's im

And how do you measure the length of a burning rod (that's moving past by you at a considerate speed) in the face of relativity of simultaneity? I guess it's impossible, and so the very concept of length must be meaningless. To actually try to answer your question: I don't know. But that's just me; and ain't there some interesting experimental setups with super-cooled crystals? In any case, inability to imagine something is hardly a convincing proof of anything.