Hi, I wonder if a gravitationally bound system ...like a binary star system (or a spinning galaxy for that matter) has a similar inertia in its rotational axis like your classic spinning top? Is there resistance to a change in the axis? I appreciate the system is not solid and so not obviously analogous but is there even a small net torque on the rotational axis of gravitationally bound bodies when the orbiting bodies axis is askew as compared with the encompassing rotational axis/gravity vector? Isn't the body (of the orbital system) that is nearer the galaxy centre of mass (at any one time) then being pulled away from its orbital partner which then adjusts ... I'm thinking maybe there is a tendency to preserve the rotational axis direction ... since otherwise wouldn't older galaxies have the rotational plane of its solar systems more radially aligned (flattened) with respect to the galaxy rotation? (perhaps they do?) If there is a net torque wouldn't that torque on rotational axis be using up ..so to speak, the gravitational energy at that point as compared with gravity acting on an equivalent non rotating systems centre of mass ? ...Many thanks for any response assuming if I have made enough sense.