Why Don’t We See Them?

  • Michael A. G. Michaud


Early in the twentieth century, pioneering spaceflight theorist Konstantin Tsiolkovskii envisioned human expansion through the solar system. If extraterrestrial colonization was in Humankind’s future, Tsiolkovskii assumed that it was an inevitable step for other intelligent beings. Those older and more advanced than we must already have expanded beyond their natal star systems.


Solar System Technological Civilization Interstellar Space Royal Astronomical Society Habitable Planet 
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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© Springer Science+Business Media, LLC 2007

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  • Michael A. G. Michaud

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