From: Robert J. Bradbury (bradbury@aeiveos.com)
Date: Thu Jul 10 2003 - 21:10:36 MDT
On Thu, 10 Jul 2003 ABlainey@aol.com wrote:
> This is also my view , that gravity being instantanious gives an unbeatable
> method of information transfer. That is of course depending on the propgation
> speed. Everything I have read thus far states that the propogation is
> istantanious.
Hmmmmm.... A google on "speed of gravity waves" yields:
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/980905b.html
http://physics.about.com/library/weekly/aa011503a.htm
http://www.nature.com/nsu/030106/030106-8.html
to which there appears to be an upstart challenge:
http://www.lbl.gov/Science-Articles/Archive/Phys-speed-of-gravity.html
So I would say that the balance of the conventional wisdom
is that gravity propagates at the speed-of-light.
It is also true that to get gravity waves one has to manipulate *very*
large masses. That is *very* expensive relative to the manipulation
of photons (which effectively have very low masses [based on E = mc^2]).
Robert
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