I even went back and re-watched the cutscene to confirm.
And you're right. It does appear that Omicron Major, a system linked by a hypergate, resides within a different (empty portion of space, lol) galaxy. It also shows the Sirius sector (the artifact's location), and Major (the 'key') as not being located within galaxies at all. Which is, uh, not how solar systems work in the first place. There isn't even a purple hypergate link visible between Minor and Major, assuming that's what the purple links are (what else would they be?), so I really cannot bring myself to believe that FL's cutscene graphics or starspheres are the word of god. We're not talking about dialogue or infocards here, we're talking about something another team entirely was asked to throw together. "Yeah so uh, we need a galactic map, and make it look cool."
The thing is that the vanilla starspheres were super accurate about the locations of stellar bodies. The best example, as I always say, is the Manchester starsphere, which not only shows the distance to New London as the New London star is directly behind the jump gate. The entire lane points at it. You can also see Rheinland's stars specifically added to the walker nebula in yellow, the same with Kusari's stars in blue in the Crow nebula. Almost every single system of vanilla has a unique starsphere - iirc two of the nebula-only systems don't have unique starspheres - and they all show the stellar bodies in relative direction and size to where they should be. Most noticable is the Barrier, which is of all nebulae the most central one - simply for the fact that Magellan and Cortez as well as Tau-37 are in the center of it, Bretonia is to the left of it with Cambridge and Omega-3 being the lower end (in Discovery it's Omega-49 and Omega-52), and Liberty, Kepler, Galileo and iirc Kyushu show it to the right.
Same goes for the big star cluster close to Cortez, which is also seen from the Taus. Edinburgh is the red spot you can see from all other Bretonian systems, according to the game files. And then there are three galaxies you can see from a few systems: the three-spiraled galaxy/galaxies from Omega-5, Omega-41 and Omicron Gamma, then the galaxy you can see from the Omicron Minor starsphere (in Discovery, mostly seen in Omicron Lost with a slight pitch to the top) and the galaxy visible from the Taus and Omicron Alpha, which is often mistaken as the Razgriz black hole (which didn't exist in vanilla).
Again, it's speculation to say these things aren't accurate in terms of lore, but the starspheres have been pretty detailed and accurate. Igiss, when establishing Discovery's lore and answering questions to the best of his knowledge said the Sirius system was a region behind the direction of the Sirius star system from the Sol system. Which of course makes sense, as why would the sleeper ships fly all the way to another galaxy to colonize some worlds.
So in the end, we're sticking to what the current set of devs say what is true and what their envisioned infocards say. Given how often infocards and opinions have changed alone in the three years of me being here, I personally rather stick to what vanilla gave us. After all, if we'd apply real life physics to Freelancer and Discovery, space battles would happen in distances so high that nobody would be seeing each other, and the last ship to overheat - as empty space doesn't really allow ships to cool down via induction and only via radiation (see the heat radiation panels of the ISS) - would win the battle, without necessarily needing to destroy the enemy.
I always understood Sirius as own little sector in another arm of the milky way galaxy since the sleeper ships arrived Sirius first steps in Omicron Gamma, Sirius lies more north western, that the whole proportions, System designs compared to other space games is a little too compressed is because of the limitations, the Map in the Cutscene looks like smth designed not in relation with everything else explained in the new, info cards, rumors etc.
That Vanilla and Disco are 2 different things is also clear for most people here, because then Gallia wouldnt exist according to the Outcast fella on Malta telling there were more sleeper ships like a french and italian one that got destroyed by the Coalition.
Working with the nebulas and star spheres you can see that eG Manchester and New London are one of the closest stars in whole Sirius since you can see NL's Star in Manchester already.
In reality the closest star lies 4.3LY away Proxima Centauri to Sol. You can already see the star of it in Sol. So this could be eG almost the same like Manchester and New London.
When looking at the tiles on the Navmap we have 1,3,5,7,9 wide tiles as distances.
So Manchester to New London is not 1 wide tile distance that is already a problem. It is 5 tiles away, so when ca. 5 tiles are 4-6 Light years we already get a problem with the 1,3 tile distances, we should be able to see every 1/3 wide tile distance star to eachother... A problem is that it is a 2D map so we dont know the "height" where they lie, as one of the disco menu screens we have actually a 3D map.
It could also be that the star we see in Manchester is not the NL star but the vanilla devs made the star sphere look like that this star really sits behind the NL JG so it could indicate it.
So 1 wide tiles could be 1-2 and 3 wide tiles 3-4 Light years. This is without putting the "height" difference (y-position) in the galaxy in aspect, this is in general a problem that Sirius is 2D plain and probably got even more stars working with a 3D map.
A Supernova has devastating effects on every system 30LY around it (it also depends on what for a star it was before) Working with our kind of distances the whole Omegas would be nuked by it. Rheinland is like 7/8 tiles away from O-11. So it lies still in range to the Nova.
Another probability for distance setting is that the Barrier is actually a Spiral Arm of the Milky way, aswell as the nebula of Bretonia, the Walker Nebula marks the end of one Spiral Arm, Crow Nebula being a Nebula of its own not a arm which can be a thing in galaxies. And the Edge Nebula being a darker smaller secondary spiral arms not being one actually being between the Barrier Spiral Arm and the most inner one in the milky way. It would also fit since the Barrier would end also like the Walker Nebula around there and Sol would lie still south eastern of Sirius.
Im talking about this picture I found somewhere where it was actually going about Discovery FL.
It's speculation but I'd assume whoever came up with the idea of letting O-11 go capella was more thinking about the two-staged scenario we had in Discovery and less about the cosmical consequences of the supernova on a house that is already dying to broken economy, a darkmatter catastrophe and generally low quality of life standards. And Wesker.
By the way, the vanilla devs literally called the star we see in Manchester "new london star" in the starsphere file. These things are all labeled, which is why we know that the red nebula you can see in Bretonia, specifically in New London from Kensington Platform in the direction to Southampton, is Edinburgh. Or that the rainbow-colored nebula you can see from the Taus in the direction of Gallia is called Aurora.
I'd be pretty reluctant to argue that omega 11 is closer to Stuttgart than proxima centari is to earth. Putting our lowest yardstick in at about 4.2 lightyears away gives us 4.2 years (2.5 or so left?) before light from the blast even reaches stuttgart.
To switch tracks and speculate wildly, using the chart that ZeCorsair posted as a benchmark, I'd argue that the galaxy there is about ten Sirius's tall.
Which makes Sirius about 10,000 light years across. Having counted (very accurate and high-realism system I'm using here) the pixels in my image of lower sirius, there's about 915 pixels between Zurich and Kappa. This gives us about 10 light years per pixel, meaning the distance from Omega 11 to Stuttgart is probably...oh, dozens of years? if not more than that, honestly, as that's not considering 3d space and the fact that the dozens of years idea is me pulling a number that ranges from 24 to...infinite...out of my back pocket with no measuring at all.
But given that we just added the light from the gallic supernova that was hundreds of years ago...that ought help inform how far jump-holes go. (tens to hundreds of light years, or...7000 light years, in the case of Zurich)
Taken together, honestly, I don't think Omega 11 is likely to be a danger to Stuttgart. At least, not in a timeframe that any of us expect to still be doing this game. Ask me again in 10 years, and we'll re-run the silly math to see if I was on the low end of "dozens".
Green circle is the main populated area.
Purple circle is Gallia.
Blue circle is Nomad space (note that Nomad systems are meant to be farther away from the "green" circle than they are on the universe map)..
Dotted red line represents the route of sleeper ships (and direction from Sol to Sirius).