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Extraterrestrial Civilizations
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<p><i>Extraterrestrial Civilizations</i> is a 1979 book by <a href="/facts/Isaac_Asimov/11oRajCj">Isaac Asimov</a>, in which the author estimates the probability of there being intelligent <a href="/facts/Extraterrestrial_life/arxCPFTQ">extraterrestrial</a> civilizations within the <a href="/facts/Milky_Way_galaxy/ulF6lccN">Milky Way galaxy</a>. This estimation is approached by progressively analyzing the requirements for <a href="/facts/Life/DNw7NUId">life</a> to exist. </p>