E.T. Talk pp 3-16 | Cite as

A Place for Life

  • Fernando J. Ballesteros
Part of the Astronomers' Universe book series (ASTRONOM)


The belief in the existence of extraterrestrial civilizations starts from the so-called principle of mediocrity. This principle postulates that Earth is a normal planet that rotates around a normal star, which in turn is located in a normal galaxy. That is to say, there is nothing so special in our world as to make it unique. This is a logical conclusion, toward which we are guided by the successive “Copernican turns” that science has suffered throughout its long history, and which has ­removed us from the central position we once believed to occupy in the universe.


Solar System Planetary System Giant Planet Stellar System Extrasolar 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.

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Astronomical ObservatoryUniversity of ValenciaValenciaSpain

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