Posted by: Nathan_
« on: January 21, 2013, 06:56:19 PM »once you spawn an NPR, that npr can trigger a cascade of star system creation, npr creation, and so on. so focus on conquering each npr in turn before doing more exploring.
That would be difficult. You'd be better off just restarting and being more careful about exploration. If you wanted to put in the effort though you can delete starsystems one by one via f9 with sm mode on. You'll have to redo jps though, which is the real difficult part.