Fermi Paradox, The

 

If there are other intelligent beings in the Universe, why aren't they here?. Since it appears to be quite possible for a technological species to spread across the galaxy in less than 10 million years (using von Neumann machines) or otherwise change things on such a large scale that it would be very visible (see Kardaschev types), the lack of such evidence is puzzling or implies that other technological civilizations doesn't exist. There have been many attempts to explain this, for example the Wildlife Preserve idea (the aliens doesn't want to interfere with younger civilizations), that they transcend and become incomprehensible, that they hide or that they are actually here, hidden on the nanoscale, but the problem with these attempts is that most of them just explain why some aliens would not be apparent. [ E. Fermi]

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"If there are other intelligent beings in the Universe, why aren't they here?". Since it appears to be quite possible for a technological species to spread across the galaxy in less than 10 million years (using von Neumann machines) or otherwise change things on such a large scale that it would be very visible (see Kardaschev types), the lack of such evidence is puzzling or implies that other technological civilizations doesn't exist. There have been many attempts to explain this, for example the "Wildlife Preserve" idea (the aliens doesn't want to interfere with younger civilizations), that they transcend and become incomprehensible, that they hide or that they are actually here, hidden on the nanoscale, but the problem with these attempts is that most of them just explain why some aliens would not be apparent. See The Fermi Paradox for more information. [E. Fermi]

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