From: fortunati.luigi@gmail.com   
      
   Sylvia Else alle ore 14:37:54 del 06/08/2017 ha scritto:   
   >>   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.   
      
     Is not it a real effect?   
   =A0=A0   
   =A0=A0At the space station there is a pill that can save life to the twin,=   
      
   provided it can have it available within 5 years.   
   =A0=A0   
   =A0=A0Since the space station is nearly 40 years old, the twin seems to be=   
      
   inexorably dispossessed because even at the speed of light (as much as   
   possible) that pill could arrive in time (it's impossible to travel 40   
   years-light in 5 years!).   
   =A0=A0   
   =A0=A0And instead, the twin can save by accelerating to gamma=3D8 because a=   
   t   
   the end of acceleration it takes 5 years to get to salvation.   
   =A0=A0   
   =A0=A0In fact, at the end of acceleration, the space station is no longer   
   at 40 years-light distance but has approached less than 5 years-light.   
   =A0=A0   
   =A0=A0Does it seem like an "apparent" effect?   
      
   Luigi.   
      
   --   
   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)