21![](https://www.pdfsearch.io/img/9831c12d10554f67ba64051dc9140348.jpg) | Add to Reading ListSource URL: www.ssl.berkeley.eduLanguage: English - Date: 2013-06-12 16:44:56
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22![Earth A One-Of-A Kind Planet Earth A One-Of-A Kind Planet](https://www.pdfsearch.io/img/cec4a8b13af77bb13abffd6de059deee.jpg) | Add to Reading ListSource URL: www.nasa.govLanguage: English - Date: 2013-07-15 20:19:50
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23![ASTROBIOLOGY Volume 4, Number 2, 2004 © Mary Ann Liebert, Inc. Research Paper The Temporal Aspect of the Drake Equation and SETI ASTROBIOLOGY Volume 4, Number 2, 2004 © Mary Ann Liebert, Inc. Research Paper The Temporal Aspect of the Drake Equation and SETI](https://www.pdfsearch.io/img/98f39728a8abdd3b6adfbc37da38feb8.jpg) | Add to Reading ListSource URL: mcirkovic.aob.rsLanguage: English - Date: 2011-03-06 05:15:28
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24![Biology and Philosophy[removed]:369–379 DOI[removed]s10539[removed] Springer[removed] Biology and Philosophy[removed]:369–379 DOI[removed]s10539[removed] Springer[removed]](https://www.pdfsearch.io/img/0c938e4bdf0e438b0a120c65e4132047.jpg) | Add to Reading ListSource URL: mcirkovic.aob.rsLanguage: English - Date: 2011-03-06 05:15:28
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25![Galactic Gradients, Postbiological Evolution and the Apparent Failure of SETI ´ Milan M. Cirkovi´ c Astronomical Observatory Belgrade, Galactic Gradients, Postbiological Evolution and the Apparent Failure of SETI ´ Milan M. Cirkovi´ c Astronomical Observatory Belgrade,](https://www.pdfsearch.io/img/489d2d0f4fdaf7b275083c87db817126.jpg) | Add to Reading ListSource URL: mcirkovic.aob.rsLanguage: English - Date: 2011-03-06 05:15:28
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26![Webfooted Astronomer News from the Seattle Astronomical Society November 2008 Where are they? Musings on Fermi’s Paradox Webfooted Astronomer News from the Seattle Astronomical Society November 2008 Where are they? Musings on Fermi’s Paradox](https://www.pdfsearch.io/img/6430050d8d9d60d883fe5096e9bfaa52.jpg) | Add to Reading ListSource URL: archive.seattleastro.orgLanguage: English - Date: 2013-05-24 12:10:51
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27![Section V, Paper 10 Speculations on the First Contact: Encyclopedia Galactica or the Music of the Spheres? Guillermo A. Lemarchand Section V, Paper 10 Speculations on the First Contact: Encyclopedia Galactica or the Music of the Spheres? Guillermo A. Lemarchand](https://www.pdfsearch.io/img/12a6fb30823a544f1fd42f2b3c4e399f.jpg) | Add to Reading ListSource URL: ieti.orgLanguage: English - Date: 2006-08-09 23:11:26
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28![Section V, Paper 9 Cultural Aspects of Astrobiology Steven J. Dick U.S. Naval Observatory Section V, Paper 9 Cultural Aspects of Astrobiology Steven J. Dick U.S. Naval Observatory](https://www.pdfsearch.io/img/c3b7ad1f05109d49dfb951fd937fafb1.jpg) | Add to Reading ListSource URL: ieti.orgLanguage: English - Date: 2006-08-09 23:11:02
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29![Section V, Paper 1 The Role of the Social Sciences in SETI Albert A. Harrison John Billingham Section V, Paper 1 The Role of the Social Sciences in SETI Albert A. Harrison John Billingham](https://www.pdfsearch.io/img/d6cce31ff32ea02cdbff8599d9aa0b78.jpg) | Add to Reading ListSource URL: ieti.orgLanguage: English - Date: 2006-08-09 23:09:55
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30![Section IV • Topic 2: Answers to Major Questions Implications of Contact with ETI Far Older than Humankind • The real challenge is surviving one’s star. Perhaps Section IV • Topic 2: Answers to Major Questions Implications of Contact with ETI Far Older than Humankind • The real challenge is surviving one’s star. Perhaps](https://www.pdfsearch.io/img/4cbfa3650485553735ddc4cc7cd86dc9.jpg) | Add to Reading ListSource URL: ieti.orgLanguage: English - Date: 2006-08-09 23:08:47
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