SOL is a huge Human presence
my two small colonies that are connected via my small gate network.
two small colonies
I can already see the hugeness!
Sorry. Couldn't resist.
Anyway, yes, this is Invaders. They have a lot of armor, moderate speed and 32kton ships aren't the largest.
Yes, things like that happen. Maybe ship is out of missiles or has sensors not working because of bug.
If you damage it enough, it'll 'awaken' and you'll be in even more trouble, because it'll either start shooting lasers or start ramming.