1.  The repulsion law*

 F = L₀ Ｍｍｒ                                           (1)

    Where  F  is the repulsion on either body,   M   and   m   are their mass,   r   is distance between two centers-of-mass and  Λ₀  is the repulsion constant.

    Suppose repulsion is like gravitation in that they have the same spread velocity.

    It can be shown that, the repulsion exerted on or by a body is the same as if the mass of body were concentrated at its center-of-mass no matter what shape and size of the body.

    The strength of the repulsion field is

 L₀ M ｒ                                                 (2)

_____________________________
*  《 The Expanding Universe 》 , A.S.Eddington, 1932 year.