Yeah, have like a server cut-off date for newcomers on a new/vet server & the server continues for either a said amount of time or "Intergalactic Conquest" is done (this can/should be done by guilds). I think guilds would play a HUGE part in the galactic conquest option (most likely the only way to do). This gives vets time to play-out their plans & not have to deal with noobs as well as noobs not having to deal with "super empires/alliances". Or possibly setting a point or a "Destruction" goal for it, like a ranking system for when it ends.

P.S. Oh yeah, in the "Veteran" server you also have to option to destroy planet/moon structures as well as the planet/moons themselves (given enough firepower). Simply give each structure/planet/moon armor points.