The Number N of Advanced Civilizations in Our Galaxy and the Question of Galactic Colonization. An Introduction
Since the oldest of the digital computers, the fingers of the two hands that as a rule are ten in number, we enjoy the marking of twentieth anniversaries. It is now just twenty years since the scientific literature began to inlcude papers dealing with the possibility of interstellar communication among putative societies spread among the stars. The idea remains a speculation, but it has drawn much attention, and with this symposium we find it reaching the level of I.A.U. as a topic for daring discussion. If the idea should ever prove correct, we may wish to modify the name - if not the acronym of this union to I.A.U., I for Interstellar!
KeywordsHubble Time Putative Society Microwave Beam Time Extrapolation Twentieth Anniversary
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