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This is not to say the zoo scenario is untrue or is somehow more unlikely than other explanations. ) Ball argued that ETCs are ubiquitous; many technological civilizations will stagnate or face destruction (from within or without), but some will develop their level of technology over time. Arguing in analogy with terrestrial civilizations, he reasoned that we need only consider the most technologically advanced civilizations. The advanced ETCs will, in some sense, be in control of the Universe; the less advanced will be destroyed, tamed or assimilated.

Such patterns are evidence of intelligence — but at the observer’s end of the telescope or microscope. 43 Chapter 3 S OLUTION 4: T HEY E XIST AND T HEY A RE U S — W E A RE A LL A LIENS ! I should have known what fruit would spring from such a seed. Lord Byron, Childe Harold In the previous section we considered the idea that ETCs might have encoded messages in the DNA of terrestrial organisms. Although this is a remote possibility, a broader version of the idea is, paradoxically, more plausible.

32 24 Of Fermi and Paradox Nevertheless, surely Hart’s key fact does require an explanation. We have been searching for ETCs for more than 40 years. And the continuing silence, despite intensive searches, is beginning to worry even some of the most enthusiastic proponents of SETI. We observe a natural universe when we could so easily observe an artificial universe. Why? Where is everybody? Fermi’s question still demands an answer. Enrico Fermi, sailing off the island of Elba. The photograph was taken shortly before his death.

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An advanced course in general relativity by Poisson E.

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