Extraterrestrial Civilizations

Some articles on extraterrestrial civilizations, extraterrestrial, civilization:

Drake Equation - History
... In 1960, Frank Drake conducted the first search for radio signals from extraterrestrial civilizations at the National Radio Astronomy Observatory in Green Bank ... asked Drake to convene a meeting on detecting extraterrestrial intelligence ... to know to predict how hard it's going to be to detect extraterrestrial life ...
Extraterrestrial Civilizations (book)
... Extraterrestrial Civilizations is a book written by Isaac Asimov in 1979, wherein the probability of there being intelligent extraterrestrial civilizations within the Milky Way galaxy is estimated ... number of planets in our galaxy on which a technological civilization is now in being is roughly 530,000." ...