If gravity is generated inside the sun by the mass of the sun, how does it initially get away from the sun out to the edges of our solar system(or the edge of the universe) so that it can pull everything back to the sun? I've heard the analogy about how it's like a funnel filled with sand and the sand is all flowing towards the hole in the bottom of the funnel but the problem I find with that is that the sand(representing gravity in this analogy) has already been put into the funnel. In reality, the sand(gravity) is generated inside the hole in the funnel(by the source) and would have to first get away from the hole so that it could flow back towards the hole. The analogy makes no sense without having some means of getting the sand into the funnel in the first place. A fountain in the center of the funnel could send the sand out so it could flow back to the center of the funnel but gravity is a one way force(always pulling back to the source) so that's not really an option. I have the same problem with the analogy of a stretched out rubber sheet with a bowling ball placed on it. Sure, it would make a depression in the sheet but in this particular analogy the sheet represents gravity and once again we have the problem of how the sheet exists where it is to begin with given that it's created inside the bowling ball. Maybe I don't have a good enough imagination to be able to understand physics.