Star One itself
As Jenna says, it's a long way out--a long way from the edge of the galaxy. At first I thought that the length of time to get there could allow Travis to make contact and the Andromedans to start sabotaging the system to cause extreme weather and other bugs, but after Jenna gives the alarm, it only takes 3-4 hours for Space Fleet forces to get there. (Which makes one wonder why it took 27 days to get to Sardos later, but that's another matter).
A white dwarf I'll buy, but why are there lights on the planet as if there are cities? The complex is fairly small, not a vast network just under the planet's surface, so is it radioactive patches or volcanic activity?
Travis and Time
As things stand, Travis has been looking for the location for Star One along with Servalan and Blake, and only discovers it on Goth. It takes a matter of hours to get to Star One, so when did he contact the Andromedans, who have been on Star One for 60 days at least, according to Durkim? And if they're there, why would Travis need the coordinates?
I believe I finally have an answer that plugs all of these gaps!
Travis was contacted by the Andromedans months ago, perhaps right after his trial, or even after Servalan put all the blame for losing Orac on him. They had already found Star One and the minefield, and had sent scouts further in to find a traitor. Travis was willing and his description was sent back to Star One (they know what he looks like but haven't met him). However he had to ensure that no one else found the coordinates before the Andromedans were ready to invade, and that's why he was on Goth, to take the brain-print before anyone else could. The Andromedans contacted him and said they were ready, so he got to Star One in one of their scoutships--Jenna didn't recognise it, and it's the infamous double-hairdryer one.
I'm not sure why he was needed for the minefield; he just presses a button. Perhaps it was one of his requirements for helping the scout(s): to be in on the final act.
My personal explanation for it is that it's used to power the installation. It's a wormhole and somehow releases energy to the power banks when trash and Travises are dropped down it. The railing doesn't look terribly strong though; Travis went straight through it. [Shakes head at yet another infringement of standard Federation Health and Safety rules.]
Gaps in Minefields
It annoyed me at first that there even needs to be a gap--why not just go round--but the invasion fleet doesn't even turn up till Travis is there. They knew they would be able to get through at that point, so just waited till they got the signal and took the shortest route. Though really, the minefield can't have been that large: Space Is Big.
Blake of course wants to destroy Central Control no matter what the cost and also has a need to justify the killing and destruction they've caused up till now as he sees it as senseless if the revolution doesn’t succeed; winning is the only way to justify his previous means. Yes, I think he's a fanatic at this point, but I know others don't agree, and why should they? We all see things differently, and I do actually support his cause--just not his means. One of the reasons I loathe the series ending is the message that fighting injustice is futile.
And that "I've always trusted you" is a lie, Blake. What happened to "Avon might run" at Horizon?
Cally's as disturbed as Vila about going out into 'infinity' and I don't blame her: she grew up surrounded by communicative minds and her worst curse is to die alone and silent. I'm a little puzzled about her readiness to blow the place up after her initial reservations, but she does have an engaging look of anticipation as she carries the bombs in. Perhaps she's just partial to a good explosion. :-)
Avon wants an end to it so that he can get the Liberator and do with it what he likes and I do see his point. The ship is fast, powerful, and if he keeps away from the Federation, he'd be fairly untouchable.
Despite all that, when it comes down to it, Avon chooses to stay and potentially die defending humanity, though he prefers to say it's a promise to Blake.
Jenna's still loyal, competent, and sensible, taking charge once Avon's been teleported down and getting Orac to check out the minefield. She has no hesitation in warning Servalan unlike in 'Killer', and quite right too; this is a good episode for her to go out on.
Vila doesn't do much--this is a Boucher script--but his is the finger on the firing button at the end. He suggests running when they first see the Andromedans, but if he were really serious, he'd have argued with Jenna or tried to take control of the ship. He says "This is stupid," at the end, but he's prepared to fight with the rest, and in fact it's Vila who will be destroying the ships.
I wonder why he's the weapons officer in S1 and S2. He's good at it, and he needs to keep busy when nervous, but it's still a strange choice. Is he quicker and more accurate than the others perhaps?
A good episode with strong characterisation and excellent OCs, especially the brave Lurena, and a great cliff-hanger to end the season on.