I'm taking impacts of some sort on Earth's surface that are throwing up minor bits of dust, destroying a few factories and more importantly seem to be killing millions. Death toll is up to 5 mil. I have a fleet of five in orbit around and ten PDCs, all with active sensors blazing (not to mention tracking stations) and fully loaded and shielded, ready to rock - but the aggressor doesn't seem to be here. Is something bombarding from out of my sensor range, and if so, how can I detect it and fight back? (Failing that, because I'm a dirty SOB, I'd like some tips on how to use SM mode to save my planet.)
It also coincided roughly with a resource packet arriving via mass driver, so to be safe I've shut off all mass drivers in the system. Unless I forgot one, a mishap with packet receiving seems unlikely.