* Mass of the objects: The more massive the objects, the stronger the gravitational force between them. This is a direct relationship; double the mass, double the force.
* Distance between the objects: The closer the objects are, the stronger the gravitational force. This is an inverse square relationship; double the distance, reduce the force to one-fourth.
These relationships are summarized in 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 universal constant approximately equal to 6.674 x 10^-11 N m^2/kg^2)
* m1 and m2 are the masses of the two objects
* r is the distance between the centers of the two objects
