I was reading another thread earlier about one of the known problems in TWOK (the apparent loss of CA6 and whether the system was really well known or mapped), and although it's always one of my favorite Trek movies, I'll agree that's one of several plot problems that could have been less problematic. It got me thinking about how exploration works in Trek, and how accurate maps can be made and retained. I can recall from memory several TNG mentions of the D exploring sectors that were new and uncharted, even with the occasional exotic and unexpected boost (like the Cytherians or Q flinging the ship into the path of the Borg). Voyager of course mapped a considerable chunk of the DQ. The concept of worlds or systems becoming "lost" is occasionally mentioned in the Battletech series as a potential game aid, though in context it's more like certain worlds being removed from "official" maps if it either serves a specific purpose or if constant war arguably screwed up the borders. ComStar apparently hid a couple of worlds this way for ages, and was also able to hide their small fleet of Star League-era capital ships because open space is vast and they could control who knew the locations of those systems, or had access. There are also worlds in the deeper Periphery that essentially fell apart once the Star League collapsed and no one remembered them. Space travel is slower and more complex in the BT universe, so that does play a role in terms of where you want to go, how to get there, and what risks might be involved. The Clan War happened because a ComStar vessel accidentally misjumped into Clan space, at least as far as the official accounts are concerned. What do you think in terms of space mapping and the likelihood of things occasionally being "lost" or concealed?