I have a lore question! If the Union was only formed three years ago, "many light-years" from the Teyn Belt, and the ships travel slower than light, how did they get to the Teyn Belt? My first idea is that it's a time dilation thing, it was only 3 years from the perspective of the people who traveled to the Teyn Belt, but I could also just change it as the Union being a little older than that, more like 10-20 years. I feel like the Teyn Belt being far from the home systems is a more important setting detail to preserve than the Union being very new, but I'm not sure.
(I know it isn't supposed to be "hard" sci-fi and I'm being pedantic, but I figured I'd ask anyway)