Hmmm, I haven't gotten very far in any of my games yet, so I don't know much about the jump gate thing. I've pretty much turned other empires off because I want to concentrate on learning how to explore and maintain an empire. If it is a foreign jump gate, do I have to worry about being invaded now? I think I have my "other empire" settings at like 50% difficulty, 0 starting empires, and like 10% or 15% chance for a new one to be created. I'm currently in year 3, so if there is risk of invasion I think I'm screwed.
Edit: Ok, I just noticed in my task groups that it has a [JG] next to the name. Is this something I should worry about, or is it like a Mass Effect scenario where it's like remnants of an ancient civilization?