* If you're considering celestial bodies, then the answer is the Sun**.

* While the Sun is the most massive object in our solar system, its gravitational force on Earth is weaker than the Moon's because the Moon is much closer.

* If you're considering objects in general, then the answer is any object that is very small and far away**.

* For example, a pebble on the surface of Mars exerts a tiny gravitational force on Earth.

It's important to remember that the gravitational force between two objects depends on their masses and the distance between them. Even though the Sun is much more massive than the Moon, the Moon's gravitational pull is stronger on Earth because it's much closer.