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Fermi's paradox, extraterrestrial life and the future of humanity: a Bayesian analysis

Published online by Cambridge University Press:  11 January 2016

Vilhelm Verendel  and
Olle Häggström
Vilhelm Verendel*
Affiliation:
Department of Energy and Environment, Chalmers University of Technology, 412 96, Gothenburg, Sweden
Olle Häggström
Affiliation:
Department of Mathematical Sciences, Chalmers University of Technology, 412 96, Gothenburg, Sweden
*
e-mail: [email protected]
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Abstract

The Great Filter interpretation of Fermi's great silence asserts that Npq is not a very large number, where N is the number of potentially life-supporting planets in the observable universe, p is the probability that a randomly chosen such planet develops intelligent life to the level of present-day human civilization, and q is the conditional probability that it then goes on to develop a technological supercivilization visible all over the observable universe. Evidence suggests that N is huge, which implies that pq is very small. Hanson (1998) and Bostrom (2008) have argued that the discovery of extraterrestrial life would point towards p not being small and therefore a very small q, which can be seen as bad news for humanity's prospects of colonizing the universe. Here we investigate whether a Bayesian analysis supports their argument, and the answer turns out to depend critically on the choice of prior distribution.

Keywords

Bayesian analysisbiogenesisextraterrestrial lifeFermi paradoxgreat filter
Type
Research Article
Information
International Journal of Astrobiology , Volume 16 , Issue 1 , January 2017 , pp. 14 - 18
Copyright
Copyright © Cambridge University Press 2016 

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References

Aldous, D.J. (2012). The great filter, branching histories and unlikely events. Math. Sci. 37(1), 55–64.Google Scholar
Armstrong, S. (2011). Anthropic decision theory. arXiv:1110.6437.Google Scholar
Armstrong, S. & Sandberg, A. (2013). Eternity in six hours: intergalactic spreading of intelligent life and sharpening the Fermi paradox. Acta Astronaut. 89, 1–13.CrossRefGoogle Scholar
Bostrom, N. (2002). Anthropic Bias: Observation Selection Effects in Science and Philosophy. Routledge, New York.Google Scholar
Bostrom, N. (2008). Where are they? Why I hope the search for extraterrestrial life finds nothing. MIT Technology Review May/June, 72–77.Google Scholar
Bostrom, N. (2014). Superintelligence: Paths, Dangers, Strategies. Oxford University Press, Oxford.Google Scholar
Bostrom, N. & Cirkovic, M.M. (2008). Global Catastrophic Risks. Oxford University Press, Oxford.CrossRefGoogle Scholar
Brandt, T.D. & Spiegel, D.S. (2014). Prospects for detecting oxygen, water, and chlorophyll on an exo-earth. Proc. Natl. Acad. Sci. 111(37), 13278–13283.Google Scholar
Cassan, A. et al. (2012). One or more bound planets per Milky Way star from microlensing observations. Nature 481(7380), 167–169.Google Scholar
Ćirković, M. (2009). Fermi's paradox: the last challenge for copernicanism? Serb. Astron. J. 178, 1–20.Google Scholar
Cox, D. & Hinkley, D. (1979). Theoretical Statistics. Chapman and Hall, London.CrossRefGoogle Scholar
Griffith, R.L., Wright, J.T., Maldonado, J., Povich, M.S., Sigurdsson, S. & Mullan, B. (2015). The ĝ infrared search for extraterrestrial civilizations with large energy supplies. iii. The reddest extended sources in wise. Astrophys. J. Suppl. Ser. 217(2), 25.CrossRefGoogle Scholar
Häggström, O. (2007). Uniform distribution is a model assumption. http://www.math.chalmers.se/~olleh/reply_to_Dembski.pdf.Google Scholar
Häggström, O. (2016). Here Be Dragons: Science, Technology and the Future of Humanity. Oxford University Press, Oxford. To appear.Google Scholar
Hanson, R. (1998). The great filter – are we almost past it? http://hanson.gmu.edu/greatfilter.html.Google Scholar
Hart, M. (1975). Explanation for the absence of extraterrestrials on earth. Q. J. R. Astron. Soc. 16, 128–135.Google Scholar
Martin, J. (2006). The Meaning of the 21st Century: A vital Blueprint for Ensuring our Future. Transworld, London.Google Scholar
Pamlin, D. & Armstrong, S. (2015). Global Challenges: 12 Risks that Threaten Human Civilization. Global Challenges Foundation, Stockholm.Google Scholar
Petigura, E.A., Howard, A.W. & Marcy, G.W. (2013). Prevalence of Earth-size planets orbiting sun-like stars. Proc. Natl. Acad. Sci. 110(48), 19273–19278.Google Scholar
Quintana, E.V. et al. (2014). An Earth-sized planet in the habitable zone of a cool star. Science 344(6181), 277–280.Google Scholar
Rees, M. (2003). Our Final Century: Will the Human Race Survive the Twenty-first Century? William Heinemann, London.Google Scholar
Salsburg, D. (2001). The lady tasting tea: How statistics revolutionized science in the twentieth century.Google Scholar
Tegmark, M. (2014). Our Mathematical Universe: My Quest for the Ultimate Nature of Reality. Allen Lane, London.Google Scholar
Webb, S. (2002). If the Universe is Teeming with Aliens… Where is Everybody?: Fifty Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life. Copernicus Books, New York.Google Scholar
Wolfram, S. (2002). A New Kind of Science. Wolfram media, Champaigne, IL.Google Scholar