* Mass: The more massive the objects are, the stronger the gravitational force between them. This is because mass is the source of gravity. Think of it like this: the more "stuff" an object has, the stronger its gravitational pull.
* Distance: The further apart the objects are, the weaker the gravitational force between them. This is an inverse square relationship, meaning if you double the distance, the gravitational force becomes four times weaker.
Newton's Law of Universal Gravitation explains this relationship mathematically:
```
F = G * (m1 * m2) / r²
```
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 objects
In short:
* More mass = Stronger gravity
* More distance = Weaker gravity
