Written by Brian Ventrudo

While having lunch with colleagues at Los Alamos National Labs in 1950, physicist Enrico Fermi mused about the likelihood of intelligent life existing elsewhere in the Universe. Fermi, one of the most astute scientists of his day, thought the size and age of the Universe means many advanced civilizations should have already colonized the galaxy, just as humans colonized and explored the Earth. But if such galaxy-wide extraterrestrial civilizations exist, he wondered, where are they?
Read more http://www.universetoday.com/2009/06/05/so-where-is-et-anyway/
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