system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why isn't Earth creating rings from space junk like Saturn from dust and stones?

Would be convenient to collect it.
gpt
Saturns rings aren’t created from random dust and stones. At least, the majority of them is not. They are created by shredding moons that get too close.

To understand why those moons got shredded, you’ll first want to understand the Roche limit. Large objects like moons, planets, asteroids, and stars are held together primarily by their own gravity. The strength of gravity reduces when the distance between two objects decreases. If a small object like a moon approaches a larger object like a big planet, the gravity from the planet will eventually be pulling on the surface of that moon stronger than the moon’s own gravity does. When this happens, the moon falls apart. We can mathematically calculate the distance where the gravitational effects of the planet on the moon will be equal to the gravity holding that moon together. This distance is called the Roche limit.

When there are many moons around one planet, these moons pull on each other and some of these moons can get pulled closer to the planet. If they get closer than the Roche limit, then the moon falls apart and it will form a ring. Saturn has a lot of moons, and it used to have a lot more than it does now.

We don’t see this around earth because we’ve only got the one moon, and it’s slowly drifting further away.