I understand centrifugal force is a force that moves an object away from the axis and thus the faster it goes (rotates) the more force is generated and the close to the axis it gets the faster it will rotate with no added outside source providing acceleration. I understand centripetal force is a force that is provided by a third source of energy providing the containment and thus pushing back against centrifugal force. My questions are, for example an object in orbit around the sun, obviously there are centrifugal and centripetal force at play on it are the centrifugal and centripetal forces provided by a third closest(largest) source of gravity? And if there where a hypothetical existence where the only sources of gravity where flat and equally given and something rotated on the surface of it would there still be a centrifugal and centripetal force reaction or is the reaction also accounted to a third source of gravity that has curvature ?