Verified answer

Speed of light. About 8 minutes

General Relativity: Another thought experiment: Einstein thought, "What exactly is gravity?" Newton described how gravity worked but could not figure out what it was. Example: The earth is attracted to the sun. But, how does the Sun do that? Where is the "rope" that allows the sun to pull on the earth? Newton ignored the question.

Einstein tackled it. And thought (My paraphrase): Suppose you were captured by aliens and drugged, you wake up in a sealed room. The room could be sitting motionless on the earth or you could be on the alien’s spaceship being taken back to their home planet. The space ship could have a soundless, vibration less rocket motor that we cannot tell if it is firing or not. If it is firing it is accelerating the room at 9.8 m/s^2 Is there any experiment that we can do that will allow you to figure out if the room is sitting motionless on the earth or accelerating through space at 9.8 m/s^2? Turns out there are no way to figure out if we are sitting on earth or accelerating through space. This means: If we cannot tell the difference, then there is no difference. ===> Gravity is not a force but acceleration that manifests itself as a warping (curving) of Space-Time. (A very profound conclusion. Newton caught a whiff of this insight, but missed its’ significants. F = MA To get a Force you multiply Mass times Acceleration).

Another way to say this: Masses are not attracted to each other, they just follow the curvature of space-time. The acceleration of gravity is the slope of the curvature of space-time.

Einstein knew from Special Relativity that acceleration would warp Time and Space ===> Gravity is mass warping Time and Space (Space-Time) ===> General Relativity

The warping of Space-Time is necessary for General Relativity. Einstein's reasoning requires it. If it was a force as Newton proposed, then if the mass of the sun disappeared the earth instantly leave its orbit. But, Special Relativity says that nothing, not even gravity can travel faster than light ====> It must take about 8 minutes for the earth to leave its orbit after the sun disappeared. With GR there would be a "ripple" in the fabric of Space-Time that when calculated actually moves at c. All this would be conjecture except we can test GR and its predictions are accurate

Very nice graphic of the Gravity Ripple at:

http://www.pbs.org/wgbh/nova/elegant/program.html

1st Hour – A New View of Gravity

The "proofs" are down in Section 4

http://en.wikipedia.org/wiki/Introductio%E2%80%A6

I saw a doc. about what Einstein's said '' Nothing travels faster then the speed of light'', and yes that's truth. If the Sun disappears right now just 8 minutes and something later (the time is take the light to reach us) , the Earth will have it's own rectilinear trajectory. So, I think the gravity should be as fast as the speed of light.

Gravity is not a force. If the sun were to blow up then each part of it would effect the surrounds as before just in disunity. So we would "feel" the same attraction but it will become distorted as the pieces fly past us. If the sun were to "disappear" then yes it would take the eight min, that light would take to get to us, for us to feel the loss of this "attraction".

This question has been posed by some of the greatest minds in astrophysics and has never been answered to anyone's satisfaction.

So, I doubt very seriously if anyone on Yahoo Answers is going to give you a definitive or satisfactory answer.

Let's just say that our sun is someday going to "run out of fuel", expand to the point where it engulfs the Earth and possibly Mars and become an red giant.

The "stress" of gravity would not commute at any velocity, it extremely is a container that exists everywhere in area. adjustments to this container (i.e. gravity waves) commute on the linked fee of light besides the incontrovertible fact that. BTW the occasion you gave of shifting an merchandise back and forth and detecting the adjustments in gravity is strictly what a gravity wave detector does. however the gadgets that they desire to discover this style are issues like merging black holes, which generate extremely some gravity waves, theoretically.