I was playing around with Galaxy Forge today and I thought it would be neat to have two star systems connected by an asteroid belt. The belt would be several asteroid types in a string splitting the 2 systems and could be accessed from either system via their respective outer planets through phase lines only. I wasn't even sure this would work as I imagined, as the 2 systems would be connected through phase lines making interstellar research redundant--as if you were playing with 1 star only. So I created it and tested it out.
Well not only did it work, but it created a pretty cool effect. The 2 systems were placed on their own "shelf" so to speak, and each shelf was on a different level in 3 dementional space. If I created a planet in the ring of 1 star, it would be on that star's level, no matter where it was placed on the map, or what planet it was connected to. Here's a snapshot to show what I mean:

I think this could be used in some really creative ways. Like I could throw in a couple of unused stars just to create other "shelf levels". Then planets could really be in 3 dimentions around a single star or whatever.
Has anyone else discovered this? Or perhaps this is already known and I'm just wasting space... 