From: '''newspam'''@nonad.co.uk   
      
   On 10/02/2026 20:22, Phil Hobbs wrote:   
   > john larkin  wrote:   
   >> On Tue, 10 Feb 2026 10:30:18 +0000, Martin Brown   
   >> <'''newspam'''@nonad.co.uk> wrote:   
   >>   
   >>> On 09/02/2026 17:48, john larkin wrote:   
   >>>> If I reply to posts from the pointy-ear guy, they go to sci.astro,   
   >>>> even though his posts are in sci.electronics.design.   
   >>>   
   >>> There is nothing odd about it at all. He has set followups to sci.astro   
   >>> which is now a hell hole where all the lunatic fringe nutters hang out.   
   >>>   
   >>> sci.astro.amateur and .moderated was created to separate the deranged   
   >>> nutters with their NEW THEROY (sic) OF THE UNIVERSE all in CAPS from   
   >>> people who wanted to talk about astronomy. It worked for a while too.   
   >>>   
   >>> Your Usenet client is doing *exactly* what it is supposed to do.   
   >>>   
   >>>> This is agent/eternal september.   
   >>>>   
   >>>> The issue was   
   >>>>   
   >>>>> 3. By contrast to light, gravitational waves are quadrupole waves that   
   are   
   >>>>> only emitted when the spacetime curvature changes in a non-spherically   
   >>>>> symmetric way.  They are also emitted by objects and systems which do not   
   >>>>> emit light.   
   >>>>   
   >>>> Suppose that somewhere out in free space a cannonball somehow   
   >>>> appeared. Wouldn't that create a symmetric, spherical gravitational   
   >>>> wave?   
   >>>   
   >>> E = mc^2   
   >>   
   >> Exactly. Mass/energy conversion is one way to create or destroy some   
   >> mass in my cannonball.   
   >   
   > Doesn’t work though—the energy has mass too.   
      
   The closest that you could come in principle to doing what he wants   
   would be in reverse and would pose some serious technical difficulties.   
      
   LEAR used to be able to hold about 10^9 antiprotons which sounds like a   
   lot until you compare it with Avogadro's number 6x10^23 (the number of   
   hydrogen atoms in 0.5g of hydrogen gas as H2).   
      
   Matter and antimatter both have a positive gravitational mass. Matter is   
   much more common though and the antimatter would need to be specially   
   made. Exactly why this matter anti-matter asymmetry exists in nature   
   remains unclear.   
      
   Start with two equal solid cannon balls of matter and antimatter. Slam   
   them together to generate annihilation radiation and as the gamma   
   wavefront expands at the speed of light it leaves behind a region with   
   no mass or energy in it. The gravitational attraction ceases in an   
   expanding shell that expands at the speed of light.   
      
   There is a step change in the gravity as the light energy goes past   
   equivalent to the mass that was destroyed in the annihilation reaction.   
      
   Maxwell's Demon would have to work double overtime and some to run this   
   experiment in reverse! ;-)   
      
   --   
   Martin Brown   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)