How come no one is talking about the massive ring world?

It really isn't all that impressive. The technology shown in the original Mass Effect could easily construct that with enough time, resources and credits to pay for it. For obvious reasons most races don't see the need to waste the money to construct something like that.

Something hundreds of millions times larger than the sun is easily constructed by Mass effect technology. Pray tell how.

Strange thing is I thought that feature was actually a system in Andromeda.
Guess I missed something.

I thought it was the heleus cluster at first, but it could be the sol system. Shinobu said something about it being an alderson disc. Liana from gameinformer also said this:

Some have speculated that it could be remnants of the Collector Base that was shot to hell in Mass Effect 2 (which I don't think so given the next sequence of events), while others think that this could be a structural graveyard seen in the wake of Reaper destruction from cycles past. It could also be the remnants of the battle with the Quarians on their way to Andromeda, which will be explored a little further down. Regardless, it is connected to the Omega Nebula, which has its own connection via a Mass Relay within the Mass Effect world.

That's an asteroid field.

If it were an artificial structure, it'd likely look way smoother than that. Looks more like gas clouds or an asteroid fields than like manmade structures.

Need I remind you of what Saturn's rings look like, and what they're composed of?

Agreed that it's likely a natural structure. But it looks robust unlike a usual asteroid field. Not an expert of these things though, so maybe an asteroid field just looks different in my imagination...

Found the ones I thought it was in Andromeda:
There were two systems in Andromeda that this reminds me of:
Pytheas:

And Dar'hegah:



Maybe its not those but they are the closest to already know star systems that fit the bill

I believe it is an artificial structure and not an accretion disc or asteroid field.

Firstly, it is too dense; accretion discs and asteroid fields are traditionally represented as a platterlike cloud of particles that can be seen through when one is sufficiently close. (See Temporal Vanguardian's videos.) This is opaque and doesn't resolve into smaller bits no matter how close the camera gets. Shadows are even seen on its surface. All of the material in our asteroid belt isn't enough to build even one moderately sized planet (it's estimated to total only 4% of the moon's mass), and it's spread over 50 trillion cubic kilometers. The asteroid belt contains so much empty space that even when one is "in" the belt it's hard to find any of the particles. It's not an obstacle course like the one we see in The Empire Strikes Back, and it's definitely not dense enough for us to see shadows on it.

www.science.org.au/curious/video/asteroid-belt
phys.org/news/2015-08-asteroid-belt.html

Secondly, there are already planets in this solar system, so it is not a young star system that is creating new worlds.


However, I was mistaken when I said that it's an Alderson disc. The original concept was a disc in our solar system that would be a solid structure thousands of miles thick with the outer rim being about the size of Mars or Jupiter's orbit. The inner rim would be within Earth's orbit (I can't find specifics on how far in). The structure would be massive enough that each side would retain its own atmosphere, although a 1000 mile high wall would be needed along the sunward rim to keep the atmosphere from bleeding off into the sun. The inner zone would be too hot for organic life and the outer zone too cold. In the Goldilocks zone (the band around where Earth's orbit would be) there would be biomes on both surfaces. Even this limited livable area would be equal to hundreds of millions of Earths. Oceans could be sandwiched between the two sides of the platter, making them "bottomless" because one could theoretically dive into the ocean on one side and come out on the other side (assuming the temperature and pressure changes could be withstood).

The disc we see in the trailer is pretty homogeneous without a visible atmosphere or surface biomes (although we may be too far away to see them). So if there are occupants, maybe they live in the interior rather than on the surface, and this structure is Alderson disc-like but not an Alderson disc.

As Ahglock said, an Alderson disc in our solar system would take tremendous amounts of material; one estimate I saw said that it would need all of the matter in a 100 light year radius of Sol to build. This doesn't take into account that one might want specific materials to build with, either. Gathering all of this stuff would take a ridiculous amount of time and effort. However, as we don't know the type of star or the size of the planets seen in middle of the disc the trailer, the amount of material to build that could be much less if the star is smaller and cooler than our sun and the planets are Mercury-sized.

This reminds me of "The planet will vomit corpses."

Hell of a thread that one.

Anything is possible and its not like bioware puts much thought into the resources required to develop a plot device. Though realistically no one should be stuck too long, just however long it takes to convert their drives to andromeda engines. But maybe those require plotium and plotium does not exist anywhere near the sol system.