Well, that's depressing. Once, people lived on these worlds. Now, little but mutants and lucky surviving fauna wander the surface. Ash storms are common, and you'll also find many ruins.
Codex description Edit
Once bustling populations lived on these desolate rocks. Their ruins stud the surface like discarded refuse. Tragic, really. Not much on these planets is of value unless you are talking about digging. You'll find ore here, at least.
Possible Weather Edit
Anti-Gravity Rain, Light Anti-Gravity Rain, Poison Gas, Dense Poison Gas, Deadly Poison Gas, Ash Storms.