When they are very close together since gravitational force is defined as , g.f.= k m1xm2/d^2 k=gravitational constant, m1 mass one, m2 mass two ,the product of the two masses, divided by the square of the distance between them.
When Is The Gravitational Force Greater Between Two Objects?
A. Have greater masses
Are farther apart
A. Have greater masses. Greater mass=greater gravity
By moving, this would be rotational rather than orbital. The larger mass has the largest gravitational pull because it is a magnetic force from ionic charges; the more the ions, the greater the forces. Rotational motion would have a tendency to emphasize the phenomena to an apparent state. But not if the mass of one was not sufficient to create a gravitational pull in the first place.