They say, only ship in this quadrant, and much later (I think about the time of DS9 starting, that's when quadrants became a thing) the Federation must be across two quadrant's of the whole $^($%@ galaxy to justify that line! That's so silly.
Umm, yeah - but this very movie rather carefully establishes that a "quadrant" is a subdivision of a "sector", and such a small unit of space that it is incredible that two starships would be in the same quadrant at the same time, unless by design.
This doesn't contradict the fact that the word "quadrant" has another use in the later movies, later seasons of TNG, and later spinoffs. Early TNG still refers to quadrants that are subdivisions of sectors, and while this practice eventually goes away, this doesn't mean that anything should have changed in-universe. References to "non-galactic" quadrants were few and far in between in TOS, the early movies and early TNG anyway, so it's not as if our heroes were quitting a major habit there.
Having those large quadrants be called "quadrants" is logical since they really are 1/4 segments of a flat galactic whole (how do you divide a cubical sector into four is less clear). It's perhaps unfortunate that the name was already taken by a less credible claimant, but not "silly" as such. And we need not concern ourselves with the "rationale" for inventing the galactic quadrants, as it isn't explicit in Star Trek, nor does it really work...
And, what makes a planet explode?
In Trek, a thousand things - it's among the least implausible issues of Trek astronomy, really. But others have stated before the rather significant fact that we only have Khan's word that CA VI "exploded". What would he know?
Assuming the mysterious kaboom was above the horizon when Khan happened to look up, what did he see? Did Khan have recording devices to properly analyze the calamity? When CA V became a hellhole, did Khan still have bright skies on occasion to continue the observations and confirm his claimed "orbital shift"?
It's largely guesswork on Khan's part, and none of the heroes get the chance to check up on the facts. Which may be "mundane and realistic", but IMHO there is no dramatic need for such a thing in Star Trek.
So he decided to repair the Botany Bay
Both versions of "Space Seed", original and remastered, show Khan leaving his old ship adrift soon after he hijacks the
Enterprise. There is no evidence they ever went back for that ship, and indeed no plot moment where that would have been practicable.
What Khan lives in, down on CA V, is modern 2260s freight containers with Federation graphics on them. They are identical in shape to the containers seen in ST:TMP, even if probably exaggerated in size a bit... Heck, there's even a workbee towing rig still attached to the containers! So that's not "remains of the
Botany Bay", but something donated by Kirk - although this dramatic intent isn't all that clear and can only be truly verified from backstage photos and detailed staring at screencaps.
What did Khan have remaining of his old ship? Apparently just his collection of books, bundled together with those old cargo straps. Everything else in his sorry hut is just random junk, cobbled together for survival and attempts at comfort.
reducing Khan's followers to kids recently born
Why reduce? Why not just have kids recently born? It's not as if Khan's cohorts would have had a reason
not to start breeding like rabbits right after touching down on CA V. And they no doubt breed well and fast, being superpeople and all...
Timo Saloniemi