From: sylvia@not.at.this.address   
      
   On 6/08/2017 8:13 PM, LuigiFortunati wrote:   
   > Sylvia Else alle ore 18:03:28 del 05/08/2017 ha scritto:   
   >> The acceleration is performed by the travelling twin. The apparent aging   
   >> occurs to the Earth twin, many light-years away. It would be surprising   
   >> if this were a causal effect.   
   >>   
   >> Instead, the acceleration just changes the travelling twin's frame, so   
   >> as to allow the calculations to be done correctly. It doesn't do   
   >> anything to the Earth twin.   
   >>   
   >> Sylvia.   
   >   
   >   The "surprising causal effect" (real not apparent) is the abrupt   
   >   shortening of the distance between Earth T and Space Station S that   
   >   passes from almost 40 light-years before acceleration to almost 5   
   >   light-years after acceleration when the 5 years of travel they are   
   >   still all to spend.   
      
   This is just a change in coordinates. It's not a real effect in same   
   sense as an abruptly aging twin would be if it could be observed, even   
   in principle.   
      
   Sylvia.   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)