1 : Am I right in thinking gravitons are the mediators of the gravitational force, just as photons are the mediators of the electrostatic force? If this is correct, then presumably the gravitational force between A and B can only be manifest (detected) in circumstances where gravitons can travel from A to B? 2 : If A is in the interior of a Black Hole (ie inside the event horizon) and B is on the exterior of a Black Hole (ie outside the event horizon), then is it possible for gravitons to travel from A to B? If the answer to (2) is "yes", how is this possible? Surely gravitons cannot travel faster than light, and therefore cannot escape the Black Hole? If the answer to (2) is "no", then how is it possible for any matter outside a Black Hole to "feel" the gravitational attraction of matter inside the Black Hole (ie the Black Hole should have no gravitational field)?