*My apologise if this has been reported/posted before*
I thought I had destroyed the Iridiums but the power score of 180 still shows them active. But, I can not find them even though I have discovered/uncovered the small map.
Although, there is a colony ship (tagged with the race prefix COS colony ship M2 that is stacked with 21 other ships on the same hex) in the old Iridium region that can not be attacked. So I'm guessing that this maybe the last remnant.