Right. Interactive maps would be one solution, but they are quite unfriendly in that they require a computer. They're also a whole other matter of complexity, and an entire different, hm, artistic style, so to speak. It's just not realistic for me to create an interactive 3d map.
Thanks.
You're right, of course, that definitions matter here. By explored I mean "visited some star systems in the vicinity". So I'd consider a region "explored" if a human visited some interesting star system within a couple of tens of light years. This would be about one interesting system in 150 others. Most systems would probably only explored remotely and automatically.
When I did the original calculations (I deviated a bit from them) I assumed the Empire had about 1100 "useful" systems (colonies, outposts etc)... so that would make one hundred sixty five THOUSAND solar systems in the Empire alone. (This further undermines the notion of "Borders" - how do you police such territories?)
I'm assuming that exponential exploration and colonization speeds would allow us to travel quite far quite quickly, but to be honest I have not modelled it accurately. Robotic exploration would still augment human exploration, especially since I do assume the development of human-equivalent AI. Furthermore the "quarter of the Milky Way" figure is easily opened up to interpretation.
I wonder how much data on the galaxy's stars we even have. I am guessing that we tried to pinpoint every star within X light years; would I know where the data is? No. Then try to process it... nah. Too much hassle for no real benefit! I'd much rather stick to large-scale interstellar features and famous / prominent stars etc.
As aside; one fringe benefit of researching for such projects is that you learn a lot. For example, I read that the thickness of the Milky Way is about 1000light years where we are. So this actually sets an upper limit on our z-Axis, and is quite relevant for a setting of galactic scale: You can't expand "up" and "down" indefinitely.
I don't mind working with "alternate universes". I subtitled this setting "History of a Future". In fact all the fictional worlds I create are officially alternate universes of each other, and two of them include knowledge on travelling between alternate worlds. The multiverse is my meta-setting.
As I said... I like to take on more than I can handle.
Thanks! I hope to continue work on the map soon, but I really need a tablet for it first. If you're really bored, feel free to take a glance at my timeline:
http://files.pandemonium.de/Voyagers...rs-history.pdf
Words of warning: It's long (23 pages including notes), it has many gaps, it is spoilery and probably waaaay too longwinded.
(Note, just to avoid misunderstandings any future reader may have: The timeline file is NOT released under any kind of open license, it remains strictly copyrighted at this point.)