Drake reasoned that if planets like Earth orbited stars like the sun, then those worlds might be populated by civilizations advanced enough to broadcast their p

Drake reasoned that if planets like Earth orbited stars like the sun, then those worlds might be populated by civilizations advanced enough to broadcast their presence to the cosmos. His logic made sense: For the last century, Earthlings have been making these sorts of announcements all the time in the form of TV and radio broadcasts, military radar, and other communications that leak into space. His logic made sense in the context of an adolescent civilization. We broadcast stuff, so if there are other civilizations out there, surely they would do the same, right? Doubtful, because that's too risky. Why would anybody want to attract attention to themselves?