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== Pranala luar ==
* [http://www.astro.washington.edu/rareearth/ Home page] of ''Rare Earth''. {{Webarchive|url=https://web.archive.org/web/20081019163719/http://www.astro.washington.edu/rareearth/ |date=2008-10-19 }}
* Reviews of ''Rare Earth'':
** [http://www.setileague.org/reviews/rarearth.htm Athena Andreadis], PhD in molecular biology.
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* Recer, Paul, "[http://www.chron.com/content/interactive/space/astronomy/news/1999/ds/990602.html Radio astronomers measure sun's orbit around Milky Way,]" Associated Press, June 1, 1999.
* Breitbart.com, "[http://www.breitbart.com/article.php?id=paUniverse_sun14_parallel_universes&show_article=1&cat=0 Parallel universes exist,]" Sept. 23 2007.
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[[Kategori:Astrobiologi]]
[[Kategori:Paradoks Fermi]]
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