Fellow Stargazers: My early post about whether "Mk19c" is the "official" designation of our solar system brought more joking than serious responses. If you Google that designation, you get (as one member described) a bunch of hits for firearms with similar designations. After more refined searching, I have to say that this whole "Mk19c" thing was an incorrect response (to a question someone asked online). No idea whether the guy just made it up, or was just confused. Bottom line: If there's ANY "official designation, it's either "The Solar System" or "the Sol System." Probably just a matter of preference. I prefer the latter, since when naming other systems, like the Alpha Centauri System or the Deneb System, it avoids the need to make adjectives out of proper nouns ... and that can be a confusing construction for many named stars. --Dan Heim -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.