Article on why the speed of gravity must equal the speed of light

[gary]

In an October 24th 2019 article at Forbes, astrophysicist and science writer,
Ethan Siegel, provides an explanation as to why the speed of gravity
must equal the speed of light, a fact borne out by the General Theory of
Relativity.

Siegal points out subtleties in what going on when a phenomena referred
to as gravitational aberration has to be accounted for in describing orbits.

https://www.forbes.com/sites/startsw...speed-of-light

[bojan]

Excellent article, and very relevant to some current discussions.. Thank you!

[gary]

Originally Posted by bojan

Excellent article, and very relevant to some current discussions.. Thank you!

Thanks Bojan,

It's funny how we look at something like Newton's law of gravitation
and might feel satisfaction at its seeming simplicity and elegance,
yet the reality is it is not quite right, things are more complex than
it models and they aren't exactly intuitive either.

[Sunfish (Ray)]

Thanks Gary. Very interesting question and one that we have all wondered about. One aspect of the article seems a little under explained is the sun and moons effects on our tides and I have always wondered whether a clever experiment could measure the speed of gravity by watching the tides from the moon.