From: titang78@gmail.com   
      
   Le dimanche 30 juin 2019 09:53:33 UTC+2, Eric Flesch a écrit :   
      
   [Moderator's note: Quoted text snipped. -P.H.]   
      
   > However, can the foreshortening (i.e., length contraction) actually be   
   > observed, is the OP's question.  Well, the length contraction is a   
   > calculational necessity which may however be enveloped by necessary   
   > uncertainties.  Consider the Bohr-Einstein debates on quantum theory   
   > -- Bohr beat Einstein's argued paradoxes by showing that they were   
   > enveloped and thus nullified by the involved uncertainties.  Now think   
   > about how hard it is to measure the relativistic length contraction --   
   > I expect that physically required uncertainties will come into play in   
   > any such attempt.  As a matter of fact, it's a sound speculation that   
   > the positional uncertainty will be found to be exactly half of the   
   > rest length of the object measured -- so that length contraction will   
   > forever be unmeasurable.  That means that the required length   
   > contraction doesn't need to be reified into actual physical   
   > contraction.  This is just typical of quantum uncertainties.   
      
   When particles travel at speed fraction of the speed of light, their   
   energy is so much larger than Planck constant that their position should   
   not be affected by quantum uncertainty.   
      
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