I'm currently plodding through a 120 planet world, working on getting the "take 110 planets" achievement. Of course, to make this "convenient" I enabled the rocketry corps - thinking I could just destroy them. Sadly, they appear invincible.
Any suggestions on to manage the warheads? (Unless there is a "kill them option")
Fallen Spire, Golems, Spirecraft, & Zenith Trader are the toys du jour. I may have the option to put a core warhead intercepter down for one or two of them due to the Zentih Trader. - but this won't manage all of them.