If the sun disappear right now, we won't notice before 8 and something minutes due to the speed of light. The earth will keep going it's way on it's orbit because, as everything, gravity cannot exceed light speed. The same would apply if we were orbiting à black hole. I often heard of the graviton, an hypothesis for a particle carrying gravity. Nothing can escape à black hole (only degenerated particles over very long period of time) so why is gravity escaping? In other words, why do black holes have a mass? Does this question makes any sense?