The Newtonian orbits of objects are independent of their mass? or density. See Geosynchronous Satellites in a Geostationary Universe, Eq 3. Who claims otherwise? That is, that predicted orbits work as expected for objects of known density? Robert ??.. Of course it could be objected that the g of the moon a la density is confirmed by the predicted orbits working quite as expected by objects of known density being sent to orbit the moon. How would you explain this ? Philip.