I've been trying to figure this out, but I haven't been able to find a good answer. I know that extractors generate a bunch of dust, but I can't for the life of me find any information about the radius they generate it at. What is a safe distance to build if I don't want the extra maintenance penalties? Is it an all or nothing thing or does it scale with distance? Also, same kind of question about rockets. How close can I land them without dusting up all my buildings and having to spend more in maintenance parts?