@FormerGameDev Introduced probably with novelizations in the 80's, so still long after TOS, but it never really appears outside of novels until Rise. This stuff that blocks hyperspace travel at the edge of the galaxy is found through out the galaxy as well, which is why they have to have well charted hyperspace routes. I think Rise is the first movie where they mention hyper space lanes as well, which sounds contrived the first time you hear it, but finding new routes is actually very risky.