According to Isaac Newton's law of universal gravitation, the force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. This means that as the distance between two objects increases, the force of gravity between them decreases.

Mathematically, this relationship can be expressed as:

F = Gm1m2/r^2

Where:

- F is the force of gravity between the two objects

- G is the gravitational constant (approximately 6.674 × 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

So, we can see that as the distance (r) between two objects increases, the force of gravity (F) between them decreases. This is why astronauts experience weightlessness in space, as they are far away from Earth's center and the force of gravity acting on them is very weak.