The strength of gravitational force between objects depends on?

The strength of the gravitation force between two objects depends upon the distance between the two objects and their masses.

F = (M1*M2*G)/R2 (Newton's Law of Gravitation)

Here M1 and M2 are the masses of the two objects, G is the universal gravitational constant, and R is the distance between the two objects.

If the masses of the two objects are large the attraction between them will also be large.

However, as the radius increases the gravitational force between the two decreases by the square of the distance.

So, the gravitational force depends mainly upon the distance between the two objects, but also significantly upon the masses of the two objects.