Upon what two factors does the magnitude of the gravitational force between two objects depend ?

the gravitational force depends on mass of the point masses involved and the distance of separation between the bodies.

Explanation:

the gravitation force between two masses is given by where G is gravitational constant, M is the mass of one body and the m is the mass of other body and r is the distance of separation between the two masses.

this formula is given by Newton through his experiments.

as we can see as we increase the mass of either bodies the force increases.

and as we increases the distance of separation force decreases.

therefore the gravitational force depends on mass of the point masses involved and the distance of separation between the bodies.