It is a collection of theories that try to explain why we haven't been contacted yet by aliens.
There is also a very good book on the subject that elaborates further on the theories of the Fermi paradox. In total there are 50 different theories, from life been too young on the universe and thus we're rather alone, to not be able to communicate because they're using superior technology.
http://www.amazon.com/Universe-Aliens-Everybody-Solutions-Ex...
It is a collection of theories that try to explain why we haven't been contacted yet by aliens.
There is also a very good book on the subject that elaborates further on the theories of the Fermi paradox. In total there are 50 different theories, from life been too young on the universe and thus we're rather alone, to not be able to communicate because they're using superior technology. http://www.amazon.com/Universe-Aliens-Everybody-Solutions-Ex...