So I never played the original Sins due to being not into RTS at the time it came out. I decided to spring for this one and had a pretty enjoyable time of it with a game on easy, albeit with a huge map with multiple systems that ended up being a little longer of a game than I think it should have been.
However, just as I was coming to dominate my own starting system, I was suddenly struck by rebel assaults across my territory, and more confusingly than that, my planets started dying off randomly. They weren't planets that were under attack, they weren't even planets that were bordering enemy territory. Just up and down the length of my empire, planets started randomly disappearing, with the message (if you moused over them to look) that bombardment radiation had rendered them uninhabitable. Fortifying the planets did nothing to prevent this, seemingly. Was this some enemy superweapon and how can it be detected and/or countered?