Not 100% sure if this is the right area for this, but it seems like it fits. I know there is already a forum thread here: Announcements | MineYourMind Community talking about the general rule for which dimensions get reset and when. I am curious if that list is accurate for Project Ozone 2. Mainly I just want to know if I build a Galacticraft space station or a secondary base on the "Kepler 22b" planet, if either of those two dimensions will get reset. According to the list on the forum thread I linked, they shouldn't, but I want to be sure.
They are not regularly reset. This does not mean they will never be reset though, players have in the past just moved everything to a dimension that is not reset regularly as a means to avoid losing progress should they stop playing a mod pack for more than two weeks, though in general items are safe up there in space, it does not mean they are safe forever as we will delete inactive space stations on as as needed basis. Now that has only happened a handful of times in my knowledge, they still are not left infinitely.
So as long as I'm still actively playing, any base I make on a space station or other planet should not be reset, correct?
Yep, we only go to those extremes when we are running out of floppy disks and start deleting things that have been collecting cobwebs for months on end.
Visiting your own space station, if it just sits there for a year and we need that floppy disk it will be removed, but again it is more likely that you'll run into a pack reset before that happens, but it could happen.