Posted: Jun 09, 2022 3:52 pm
by Spearthrower
Even proposed ideas of stationing man-made structures in Lagrange points accepts that on-board propulsion systems for corrections would be necessary as no Lagrange points are perfectly stable (to the best of my knowledge) due to following the radial velocity of their parent bodies, and those bodies themselves tend to have some eccentric deviation from an idealized orbit.

Even were some debris able to find its way in, it would soon find itself captured by the planetary body's gravity well. And it's very hard for something to just wander in. Debris entering is either part of the original proto-planetary disc, and thus has the same angular momentum as the rest of the system, or the debris would be from deep space and would be traveling fast and oblique, and wouldn't even slow down perceptibly.