As more Drengin forces close in on the mining starbase at Quendor, my ships escape the sector, leaving the mining starbase unmanned:

It's too bad I can't rig the thing to blow up when they drop out of hyperspace.
Although this will leave Quendor II unprotected in the event of a ground invasion, recent intelligence reports have revealed that the Drengin only have two troop transports available, and neither of them have been spotted near this sector. Hopefully when the Drengin realise there's nothing else to shoot at, they will move on and terrorise the Thalans.
My efforts to destroy the Drengin starbase are thwarted:

Their first attack took out the five-fighter squadron. I attempt to evade the Drengin fleet, but it's no good. They come after my backup squadron and blow it to pieces:

Obviously, I could send more ships in, spread them out so that they can't all be taken out but... well look, the Drengin have lots of ships. They now have a speed advantage over my ships, a logistics advantage, and one hell of an offensive advantage. And I think I made them angry, too.
Of course the game is far from lost at this point, but I'm all out of brilliant plans to save my empire. Buying time while my scientists work isn't going to cut it, because I would need to research all the way up to Photonic Torpedoes (or a similar level of one of the other Advanced Space Weapons branches) in order to equal the firepower the Drengin currently possess. You've already seen that the Drengin aren't all that interested in peace. The Altarians really haven't got juiced up enough from that artifact to even swat a fly, and the only other race that might have been able to stop the Drengin has decided to ally with them.