Sagan's calculations
Captured from CLEVELAND FREENET, October 10, 1987 OVERVIEW AND REWRITE OF PREVIOUS UFO RELATED UPLOADS [Rick Dell'aquilla] Astronomer Dr. Carl Sagan, the acknowledged guru of professional UFO "skeptics", has been quoted as saying, "Extraordinary claims require extraordinary evidence." Another of the better known of these professional UFO skeptics, Phil Klass, has admitted the possibility of intelligent life elsewhere than planet Earth, although he finds no convincing evidence that UFO phenomena indicate visitation to Earth by alien intelligence. In his book, COSMOS, Dr. Sagan postulates a formula that suggests that many, perhaps most, stars have planets, and that the number of potentialy technologically advanced civilizations in the Milky Way galaxy can be estimated by the formula: N* X fp X ne X f1 X fi X fe X fL...