Here's why:

* Inverse Square Law: The force of gravity follows an inverse square law. This means that the strength of gravity decreases proportionally to the square of the distance between two objects.

* Example: If you double the distance between you and the Earth, the force of gravity between you and the Earth becomes four times weaker (2 squared = 4).

* Never Zero: Gravity never completely disappears, even at incredibly large distances. It just becomes incredibly weak.

Think of it like this: Imagine you're holding a magnet. The closer you bring a piece of metal to the magnet, the stronger the pull. As you move the metal further away, the pull gets weaker but never completely goes away.

Important Note: The strength of gravity also depends on the mass of the object. More massive objects have stronger gravitational fields. So, while gravity weakens with distance, a large object like a planet will still exert a significant gravitational pull even at great distances.