Using the modern data the scientists behind a new paper proposed that there should be around 36 different CETI's (Communicating Extra-terrestrial Intelligent Civilizations) in the Milky Way Galaxy, says popular science YouTube star Anton Petrov. Using the modern data the scientists behind a new paper proposed that there should be around 36 different CETI's (Communicating Extra-terrestrial Intelligent Civilizations) in the Milky Way Galaxy, says popular science YouTube star Anton Petrov.