Did you read my previous comment in detail?
replyPeople don't live in caves, they will create light pollution everywhere, anyway. Might as well put them in small and dense population centers.
I hate reading comprehension these days :-)
You said: "Nobody "creates" population centers."
replyThat's demonstrably false, population centers are created all the time. The fact that populations don't spontaneously appear is irrelevant.
I said a lot more than that and this entire discussion is in the context of high speed trains and light pollution.
replyAgain, reading comprehension, context, and I guess, typical techie obtuseness.