Interestingly .. one system I mined at had a population of zero when I first arrived, not classified as having any type of economy. After a few visits (quite a few - in AspX at the time - I admit) I found the pirates and miners spawned by my visits and maybe even my own, raised the population of the system to 15 and today it's classed as an extraction system and now has RES there. Therefore it's possible to colonise a random system for the first time and expand the bubble .. yourself .. which is quite a cool feeling.
o7
That is really cool