On Wed, 08 Jun 2011 21:20:29 -0700, the following appeared
in sci.skeptic, posted by John Smith :

On 6/8/2011 9:18 PM, Olrik wrote:

...
You will wait a long time, John Smith.

Meanwhile, John Smith, EM waves still propagate in a vacuum at the speed
of light.

Yep, a vacuum full of gravitational ether, same stuff which conducts
light -- just another form (frequency) of EM ...

Einstein's "gravitational ether" was a metaphor (you can ask
Mommy what that means) and no physical medium is required
for the propagation of EM radiation.

IOW, there's no "stuff"; there's only spacetime shaped by
mass and energy.
--

Bob C.

"Evidence confirming an observation is
evidence that the observation is wrong."
- McNameless