First Look at Kepler SETI Candidate Signals “The signals below are undoubtedly examples of terrestrial radio frequency interference (RFI). … These signals look similar to what we think might be produced from an extraterrestrial technology. They are narrow in frequency, much narrower than would be produced by any known astrophysical phenomena, and they drift in frequency with time, as we would expect because of the doppler effect imposed by the […]