Seth Shostak quote

Planets that don't currently sport plate tectonics, such as Venus and Mars, are scarcely habitable. Tectonics might be a requirement of any world that aspires to a rich diversity of life.
Seth Shostak

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Confessions of an Alien Hunter: A Scientist's Search for Extraterrestrial Intelligence
Confessions of an Alien Hunter: A Scientist's Search for Extraterrestrial Intelligence
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