  The dynamics of large scale gravitational structures like galaxies, local
groups and clusters is studied based on the so-called {\it Liquid-Droplet}
model describing the saturation property of the nuclear force. Using the
assumption that the gravitational force is also saturated over large scale
structures, it is argued that the Newtonian gravitational potential may be
replaced by an effective {\it Machian} gravitational potential. Application of
this new potential at these large scale structures may give the rotation curves
in good agreement with observations. Then, the virial theorem for this kind of
gravitational interaction is developed and also the Tully-Fisher relation is
obtained. A physical explanation is given for the so-called {\it constant}
acceleration in the MOND as the {\it effective} gravitational strength of these
structures. Finally, a brief argument is given for comparison with dark matter
models.
