From: fortunati.luigi@gmail.com   
      
   John Heath alle ore 18:03:27 del 05/08/2017 ha scritto:   
   > What if T and S move and the vacationing twin stands still. Now it is   
   > all backwards with T and S 1 year older and the vacationing twin 79   
   > years older. Hmmm ?   
      
     It's the acceleration that makes the difference.   
   =A0=A0   
   =A0=A0Regardless of what happens in the next five years, at the end of   
   acceleration, the distance of nearly 40 years-light has decreased to   
   almost 5 years-light.   
   =A0=A0   
   =A0=A0If the space has contracted abruptly, time must have expanded   
   abruptly.   
   =A0=A0   
   =A0=A0But (I repeat) the sudden change is not due to uniform motion but   
   acceleration.   
      
   --   
   Luigi Fortunati   
      
   Credere e' piu' facile che pensare   
   Believing is easier than thinking   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)