The so-called Fermi Paradox
(Hart-Tipler argument) is another theory that addresses the question,
Why haven't we discovered alien life?
The theory highlights the contradiction between the high estimates of
probability for the existence of alien life and the total lack of
evidence for it. The tenets of the theory state that our sun is a
common star, and there are billions of stars in the galaxy. With high
probability, some of these stars will have Earth-like planets, and it
would stand to reason that some of these planets would therefore
develop intelligent life. Some of these civilizations would develop
interstellar travel (which we Earthlings are currently developing.)
Even if we consider that developing interstellar travel is likely to
be slow, our galaxy could be completely explored in about a million
years. When considering all this, some have pointed out that we have
no convincing evidence of aliens, nor any signs of alien intelligence
anywhere in the universe. The famous question essentially sums up the
theory: “Where is everybody?” The “Fermi Paradox” indicates
that, due to a total absence of evidence, it can be concluded that
aliens don't exist.
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