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 "inversely proportional to the square of the distance" part is crucial. It means that if you double the distance between two objects, the gravitational force between them becomes four times weaker (2 squared = 4). If you triple the distance, the force becomes nine times weaker (3 squared = 9).
In summary: As space objects move farther apart, the gravitational force between them weakens significantly due to the inverse square relationship described by Newton's Law.
