From: nobody@invalid.invalid   
      
   Am 27.09.2017 um 00:01 schrieb Luigi Fortunati:   
   > The planet P distant 20 light-year, photographed with a telescope from   
   > Earth, appears as it was 20 years ago.   
   >   
   > An spaceship approaching P at gamma=4, while passing beside the earth,   
   > also takes a photo on planet P with the telescope.   
   >   
   > According to my calculations, in the spaceship picture, planet P appears   
   > as it was 160 years ago.   
   >   
   > Is my calculation accurate?   
   >   
      
   No. According to the spaceship-observer, planet P is in a distant of   
   5 lightyears, so the light detected by the spaceship-telescope, was   
   sent 5 spaceship-years ago.   
      
   Ciao   
      
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