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Baris 15:
** [http://www.setileague.org/reviews/rarearth.htm Athena Andreadis], PhD in molecular biology.
** [http://www.findarticles.com/p/articles/mi_m2843/is_6_25/ai_79794362 Kendrick Frazier], editor, ''Skeptical Inquirer''.
* "[http://www.astrobio.net/news/modules.php?op=modload&name=News&file=article&sid=139 Galactic Habitable Zone,]" ''Astrobiology Magazine'', May 18, 2001.
* [[Gregg Easterbrook]], "[http://www.theatlantic.com/issues/88aug/easterbr.htm Are We Alone?]" ''[[The Atlantic Monthly]]'', August 1988. Article that anticipates REH in some respects.
* Solstation.com: "[http://www.solstation.com/habitable.htm Stars and Habitable Planets.]"
* 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:Bumi]]
[[Kategori:Astrobiologi]]
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