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It carries on for as far as you like, but it gets progressively weaker.
does anyone knows about it? 
The gravitational force of the earth extends as far as the earth has existed in years, times the distance light has traveled in that time. [This assumes the general belief gravity does not propagate instantaneously]. The strength of the force is inversely proportional to the square of the distance.Accordingly, the direct gravitational effect of the fully developed earth extends about five billion light years in all directions. This effect operates on every particle or photon that is subject to gravitation. I am unaware of any that do not.One big question I neither understand nor can with authority comment on is this: Is gravity in anyway subject to Red Shift. Scientists have been looking for gravity waves for years. If they ARE waves, then the question includes whether these waves have a frequency. Personally, I do not believe they are waves or have a frequency.For instance, an atomic bomb very suddenly loses mass upon detonation. Its gravitational force is reduced accordingly. I simply believe that lesser gravitational force [accordingly dispersed with the remaining matter] simply propogates all at one time at the speed of light, just less of it. Less a wave then a bump.PS: sean - you wrote: "In essence it has an effect thoughout the visible universe...." This is only the case if gravity is instantaneous, which I believe is not current theory. Otherwise its effect extends only about 5 billion light years.