On Oct 13, 5:35 am, Sancho's Atomic Trousers
wrote:
Waves, virtually by definition, travel at the rate at which change (in
the configuration of a given medium) is propagated in that medium.

Thus it follows -- almost from definition -- that the speed of
gravitational waves (a la Einstein) is the same as the "speed of
gravity".

And if the former is in fact c, so must the latter be.

G-wave detectors have been strangely silent
to the chagrin of GRist's. I think there was
a high expectation we'd get a good thumping
signal by now, but it didn't happen, therefore
there is no hard evidence of g-waves.

OTOH, you can imagine if the Sun blew up
to become all EMR, it would take 8 minutes
for us to know, (the distance from the Sun
to Earth is 8 Light minutes).

GR (IMO) uses and depends upon light to
predict it's effects, therefore the
sense of gravity would disappear 8 minutes
after the Sun blew up.
Aside from the EMR passing Earth the effect
of the Sun disappearing would hardly be
noticeable gravitationally, because the
Earth is in free-fall, and would continue
to be.
Solar tides would cease.
Regards
Ken S. Tucker