I was thinking about Raxxla, a rock maybe and unremarkable moon but also a portal to another realm.
In early Astronomy because of it's spongey porous nature, it was speculated that Phobos was hollow. Those crazy Boffin's claimed in the 50's and 60's that Phobos was an alien asteroid base.
But in Elite Universe, what if it was not just an asteroid base, but a jump-gate, to witch-space, built into the asteroid-like moon, which then after some experimenting and reverse engineering by the federation as they developed the FTL drivers, hit a glitch and it teleported itself away (like the Philadelphia-experimented)
Phobos (if it is indeed Raxxla) could now be hiding in one of the games many asteroid clusters.
It would go to lengths, as to explain why no one has found it.
Explorers didn't care about scanning asteroid clusters as that required some time-consuming precision flying around stars far far away....prior to the FSS.
And even if scanned with the FSS, would it even register as anything else but an asteroid cluster?
It means we would then have to check out each asteroid cluster in person, and visually have to check out the asteroids to make sure they aren't one of Mar's missing moons.....you know for those that have eyes to see.....
and the only ones who are willing to physically inspect every rock are the miners and they prefer mining the rings of planets, not some a couple of Asteroids cluster each with 3-4 'roids in them 333,000 ls away.
So please someone sink a hole in this idea, as this could get painful very quickly.
