Why send the passives again? Didn't it fully scan first time? - Pirates. They might appear anywhere, anytime. The Mata Hari can keep watch while the James Bond goes through its shake-down.
Also, can passives spot stuff actives can't? - Yes. An Agent's AS101/R11 RADAR could spot a HS-4 Fighter at 13 m-km, and a size-6 missile at only 75,000 km. A large Passive Thermal could spot both long before then. Basically, small hot objects are best detected on Passives. Or small, strongly emitting objects like our RADAR probes.
What type of overhaul is needed of a fleet when it returns? Just shore leave? - Military ships need actual overhaul and maintenance. They are unavailable during that period.
Do the Galapagoans necessarily move all over their system, thouhg, unless there's something to chase. - I don't know. I would expect them to chase any Pieates that showed up.
Why are they called parasites? - Smaller craft inside larger craft are called Parasites. It's a technical term.
Ouch. They'll get into problems with needing shore leave, etc. right? - Lack of shore leave only has a noticable effect on Military ships, where you want high morale. If a Freighter comes under enemy fire, you WANT it to break and run away, so low morale is not really an issue.
Why do you need to fire them from teh JP? Why not from any other point, like hte pint you wre on? - Just a test. We're developing a doctrine and the associated tactics.
Do you specify the ship model yourself? And if so, was it then also you who gave the goons the star destroyer as their ship model? - Aliens get a random model. Hazards (like the Goons or the Galapagonians) have specific models assigned by Steve. We can change them, if we want.
Do we know any black holes? - Nope.