1. Mass: The more massive the objects, the stronger the gravitational force between them. This is because mass is a measure of how much matter an object contains, and matter is what creates the gravitational field.
2. Distance: The closer the objects are to each other, the stronger the gravitational force between them. This is because the gravitational force weakens as the distance between the objects increases. The force decreases with the square of the distance, meaning if you double the distance, the force becomes four times weaker.
These relationships are described by Newton's Law of Universal Gravitation:
* F = G * (m1 * m2) / r²
Where:
* F is the force of gravity
* G is the gravitational constant (a universal value)
* m1 and m2 are the masses of the two objects
* r is the distance between the centers of the two objects
