I made a few on a moon, how do they/do they even work? I couldn't figure it out so I had to settle for launching all 8 of my nukes at the enemy
It's been mentioned heaps of times now on the forums(including numerous threads exactly the same as this one), so probably go searching next time before asking a question like this. Anyway a planet has to have a small enough radius to have Halleys work (<250 when I last checked). If Halleys can move a planet it will have little grey icons next to the planet name in the system view. If said icons have a little "5" in them it means each icon counts for 5 thrusters. They'll turn green as you build the corresponding thrusters, when they're all green you can select to launch with them by selecting the planet in the system view.
