I find this old dev diary quite interesting, Braben talks about evolving galaxy, I've seen a little bit of this but not as complex as he explains in this video, yes I know about the community goals but what Braben says in the video I's something that happens on a more fluid dynamic galaxy at least is what I think he means, the community goal are one or 2 fixed goals hence not as much as a evolving galaxy per say.
https://www.youtube.com/watch?v=5uKD1ap5hsI
https://www.youtube.com/watch?v=5uKD1ap5hsI