I've been exploring the galaxy a bit more. One day, as I was checking up on my explorers, I noticed that one of the jump points I'd uncovered had a jump gate on it. A jump gate that I hadn't built. "Ah-ha!" I said to myself, "There must be aliens about!" So I sent my explorer to jump through the gate. I jumped into the system of Temple Balsall. It's a bit of an odd system. A secondary star is orbiting the primary star. However, the primary star also has another planet in orbit past the secondary star. ie It's even further out. Sadly, Temple Balsall proved to be empty of any life forms. So I turned back to Gardeny, which was the system where I first noticed the jump gate. Taking a closer look, I noticed something odd there. It was a quad star system, with a secondary star orbiting the primary, and then both stars had another star orbiting them. "Gazooks!" I said to myself (I really ought to stop doing that) "This star system must have been made by precursors!" Of course, I had no idea if the precursors could even do such things, but it sounded like something they'd do. Eventually I found a precursor vessel orbiting Star-D. I know that it's a precursor vessel because it was freaking huge, and there were no colonies in the Gardeny system. Sure, my sensor tech is crap, but I should be able to find a colony if my ships are right above the planet.
Of course, I can't attack the precursors right away. Since my sensor tech is so terrible, I've been developing a dedicated sensor ship to tag along with my fancy new destroyers (Which now have shields! Yes!). Eventually I'll have to design a supply/jump ship to extend the range of my destroyers, but that's in the future, along with my plans for cruisers and battleships.
Colonization is going perfectly. I have around 5 extra-solar colonies set up, all with 0 colonization cost. I'm just waiting to produce all the extra industry so that they can start producing ships and minerals for the war effort.