As the distance between two objects INCREASES, the forces of gravity between them proportionally DECREASES.
For example, if the distance is:
- Doubled, the force becomes 1/4 of the original force
- Trebled, the force becomes 1/9 of the original force
To stay in orbit at a particular distance, objects must orbit at a particular speed. This balances the gravitational force.
So the further away an orbiting object is, the longer it takes to make a complete orbit.
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