In 2010 the Search for Extraterrestrial Intelligence (SETI) was 50 years old, and the anniversary provided an appropriate opportunity to take stock. In particular,
there have been calls to widen the search by considering not just purposefully-directed radio messages, but the most general signatures of intelligence [1]. Alien intelligence, if it exists, or has existed, might have endured for a very long duration, measured in millions, tens or hundreds of millions or even (in principle) billions of years,
and will almost certainly be dominated by post-biological
intelligent systems. Thus it may lie far beyond
In 2010 the Search for Extraterrestrial Intelligence (SETI) was 50 years old, and the anniversary provided an appropriate opportunity to take stock. In particular,there have been calls to widen the search by considering not just purposefully-directed radio messages, but the most general signatures of intelligence [1]. Alien intelligence, if it exists, or has existed, might have endured for a very long duration, measured in millions, tens or hundreds of millions or even (in principle) billions of years,and will almost certainly be dominated by post-biologicalintelligent systems. Thus it may lie far beyond
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