I have a question about gravitation, that may be a "duh" question and apparent -- to everybody but me. Say that a mass effecting the geometry of space/time is the cause of gravitation, per what I understand about what Einstein said. Wouldn't that mean that the mass has to do this on a continuing basis? It seems to me that a one time effect couldn't keep up the long term effects that we see of gravitation. If that is the case, I have a related question. How often is the effect propogated, and what is the limiting factor of how often/fast it is performed? The simple answer might be "it is done at the speed of light (or hypothetical gravitons)", but I'm not so much asking how fast as how OFTEN. Bringing in quantum actions, I don't know if it could be continuous. Is how often the effect performed somehow related to the HUP?