2009/01/01 by Milan M. Cirkovic, M.M. Cirkovic · 6 citations
Earth and Planetary Sciences · Physics and Astronomy · Psychology · #Earth Systems and Cosmic Evolution #Paranormal Experiences and Beliefs #Space Science and Extraterrestrial Life #astro-ph.EP
paper · pdf · doi:10.2298/saj0978001c
published as Serbian Astronomical Journal, vol. 178, pp. 1-20 (2009) · 39 pages, 3 figures, slightly expanded in comparison to the journal version
openalex publication_date 2009/01/01 · arxiv created 2009/07/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We review Fermi's paradox (or the "Great Silence" problem), not only arguably the oldest and crucial problem for the Search for ExtraTerrestrial Intelligence (SETI), but also a conundrum of profound scientific, philosophical and cultural importance. By a simple analysis of observation selection effects, the correct resolution of Fermi's paradox is certain to tell us something about the future of humanity. Already a more than three quarters of a century old puzzle - and a quarter of century since the last major review paper in the field by G. David Brin - Fermi's paradox has generated many ingenious discussions and hypotheses. We analyze the often tacit methodological assumptions built into various answers to this puzzle and attempt a new classification of the numerous solutions proposed in an already huge literature on the subject. Finally, we consider the ramifications of various classes of hypotheses for the practical SETI projects. Somewhat paradoxically, it seems that the class of (neo)catastrophic hypotheses gives, on balance, the strongest justification for guarded optimism regarding our current and near-future SETI efforts.