when setting the homeworld via the colony details screen, the civilization capital does not move with the homeworld. ie you seem to be stuck with it forever. the civilization capital cannot be demolished or downgraded, and initial colonies cannot be upgraded into civilization capitals, even though the initial colony is now the homeworld. Is there a tech further back (most games I had ended around frigate-era) that allows civilization capital to be moved, or is there another way of moving it? Is it possible to change via save game editing?