* Mass of either object increases: The more massive the objects, the stronger the gravitational attraction between them. This is a direct relationship.

* Distance between the objects decreases: The closer the objects are to each other, the stronger the gravitational attraction. This is an inverse relationship.

Here's a simple analogy: imagine two magnets. The stronger the magnets, the stronger they pull on each other (mass). The closer the magnets are, the stronger they pull on each other (distance).

The mathematical formula that describes this relationship is Newton's Law of Universal Gravitation:

F = G * (m1 * m2) / r^2

Where:

* F is the force of gravity

* G is the gravitational constant (a fixed value)

* m1 and m2 are the masses of the two objects

* r is the distance between the centers of the two objects