Picture a small mass orbiting around a large mass. Now picture both masses at rest, but the large one is spinning. They are both the same system but viewed from different frames, newtonian gravity says nothing about the angular momentum of the larger mass, so in the second referance frame it would still predict that the two masses will get pulled together over time, but we know that that will not happen, because the smaller mass is orbiting around the larger one. I'm betting GR would predict differently because the second referance frame is an accelerated frame. How does this relate with the predictions of GR and the machian interpretation of centrifugal force? Is there such thing as an unaccelerated referance frame, since there is always something in the universe that is spinning?