From: els.dallas@gmail.com   
      
   On Saturday, June 3, 2017 at 5:15:47 PM UTC-5, 0something0 wrote:   
   > The only problem with this is that the projectile is moving at nearly the   
   speed of light, so when you see it, its already there, which means its going   
   to take some handwavium to create an early-warning system, whcih would involve   
   FTL communications. We    
   would need to be careful to create an ftl device that doesn't defeat the   
   purpose of the early-warning system.   
      
   No FTL is required for early detection of an RKKV. It just takes a large   
   enough optical array to be able to detect the RKKV while it is still hours or   
   even years away. Due to its velocity, the RKKV will be glowing from collisions   
   with the interstellar    
   medium, its reflected light signal will have a relativistic doppler shift, and   
   it will even disturb the CMB whose photons will be colliding with it.    
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)