There is this in invisible boundary around the planets of the Solar System called the Roche Limit. Should a moon fall into it, gravity will break apart the moon. Where that limit resides depends on the gravitational strength of the planet and the make up of the moon. Saturn’s rings comes from doing this to maybe several moons.

I have a friend from college with this surname. Every time this person goes to shred people online for having said something offensive, I think of this. And it makes me smile.