As this is my first post, I feel obliged to start by thanking Steve for this great game. I haven't got so deep into a game in a long time. Kudos!!!
Now back to my question. I jumped a scout into an empty system. One star, no planets, no chunks, nothing at all. Then I'm "hit" by a monster active sensor, 33000 in strength, 100 resolution. The best (and biggest) level 3 active sensor I can build could barely reach 8000. My alien cannot make more than 1000km/s, so I was able to ran as far as possible and shut down my engines (laying low...).
Am I blessed with a precursor?