Wanted to give a little update 46 years into my current game, which the longest I have managed so far. It's has also been quite interesting.
The biggest threat at present time is likely the aliens first encountered in the Herning system. You can see that a number of systems are marked as controlled by them. These are the systems, in which I have encountered their ships. They are branching out a lot, and we're excited about the prospect of figuring out the web of jumpgates that lie behind our southern" border. They have shown their presence in system chains that go through Sol, so either we're really blind or there is some interesting cross-gating going on. They also seem quite aggressive. We have not been able to establish communication, and a deep space survey vessel managed to witness their assault on the home planet of another alien race in the Faborg system. Unfortunately we lost the survey vessel as it tried a reckless rescue maneuver, and was blown to pieces.
A more immediate threat, however, is the Livorno empire situated in the Grena system. Friendly at first and open to communications, but they expanded their gate network too fast, and measures to be taken to ensure control of our own borders. A war ensued more than a decade ago, but everything has been quiet for quite some years now. Until recently, when a new host of gatebuilders flooded through and continued their work. Have suffered heavy losses we were unable to respond to this new presence, but within a year our fleet will be rebuild and heavily upgraded. Which is fortunate, as a Gas giant in Randers holds immense amounts of Sorium, and control of that could provide for the next generations (500 mill at 0.9 acc.). Furthermore, we are running low on gallicite, and if this fleet doesn't pull through, it will be decades before we can muster a proper response once more.