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Wikipedia--
Wikipedia--
The Fermi paradox (or Fermi's paradox)
is the apparent contradiction between high estimates of the
probability of the existence of extraterrestrial civilization and
humanity's lack of contact with, or evidence for, such civilizations.
The basic points of the argument, made by physicists Enrico Fermi and
Michael H. Hart, are:
The Sun is a young star. There are
billions of stars in the galaxy that are billions of years older;
some of these stars probably have
Earth-like planets which, if the Earth is typical, may develop
intelligent life; presumably, some of these
civilizations will develop interstellar travel, a technology Earth is
investigating even now, such as that used in the proposed 100 Year
Starship; at any practical pace of
interstellar travel, the galaxy can be completely colonized in a few
tens of millions of years.
According to this line of thinking, the
Earth should already have been colonized, or at least visited. But no
convincing evidence of this exists. Furthermore, no confirmed signs
of intelligence (see Empirical resolution attempts) elsewhere have
been spotted, either in our galaxy or in the more than 80 billion
other galaxies of the observable universe. Hence Fermi's question,
"Where is everybody?
