From: jl@glen--canyon.com   
      
   On Mon, 09 Feb 2026 16:02:28 -0500, DJ Delorie  wrote:   
      
   >john larkin  writes:   
   >> Suppose that somewhere out in free space a cannonball somehow   
   >> appeared. Wouldn't that create a symmetric, spherical gravitational   
   >> wave?   
   >   
   >I would assume that by the time you had the tech to make a cannonball   
   >"somehow appear" in free space, you'd already know the answer to this   
   >question ;-)   
      
   Making a sphere of mass suddenly appear is a separate issue. There are   
   ways it might be done.   
      
   But the gravitational effect will spread spherically and symmetrically   
   at the speed of light, from the instant of mass creation/destruction.   
   Is that a gravitational wave?   
      
      
   John Larkin   
   Highland Tech Glen Canyon Design Center   
   Lunatic Fringe Electronics   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)