Here's why:
* Newton's Law of Universal Gravitation: This law states that 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 their centers.
* Inverse Square Law: The "inverse square" part is crucial. It means that if you double the distance between the objects, the force of gravity between them becomes four times weaker (2 squared = 4). Triple the distance, and the force becomes nine times weaker (3 squared = 9).
In summary: As the distance between two objects increases, the force of gravity between them weakens significantly.