The Number N of Advanced Civilizations in Our Galaxy and the Question of Galactic Colonization. An Introduction

  • Philip Morrison
Part of the Astrophysics and Space Science Library book series (ASSL, volume 83)


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!


Hubble Time Putative Society Microwave Beam Time Extrapolation Twentieth Anniversary 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© D. Reidel Publishing Company 1980

Authors and Affiliations

  • Philip Morrison
    • 1
  1. 1.Department of PhysicsM.I.TCambridgeUSA

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