I'm sure this can be found somewhere in the manual, but I haven't found it so that's why I'm asking here:
What does it mean to control a system (containing at least one planet) for purposes of the diplomacy card (in SE) or some of the action cards? Do you have to control all the planets and ships in the system, or is it enough if you are the only one who have any ships there? What if you have a fleet there and you control one planet but an opponent controls another planet in the same system?