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Baris 17: * {{cite web \| url=http://www.planetarybiology.com/exoexplorer_planets/\| title=Exoplanets in relation to host star's current habitable zone \| work=www.planetarybiology.com \| accessdate=}} * {{cite web \| url=http://www.planetarybiology.com/exoexplorer/\| title=exoExplorer: a free Windows application for visualizing exoplanet environments in 3D \| work=www.planetarybiology.com \| accessdate=}} * {{cite web \| url=http://www.planetarybiology.com/downloads/astronomical_circumstances_06.pdf\| title=Calculating the location of habitable zone at zero age main sequence (ZAMS) \| work=www.planetarybiology.com \| accessdate=2008-11-10\| archive-date=2008-07-04\| archive-url=https://web.archive.org/web/20080704064637/http://www.planetarybiology.com/downloads/astronomical_circumstances_06.pdf\| dead-url=yes}} * {{cite web \| url=http://www.newscientist.com/article/mg20026831.600-why-the-universe-may-be-teeming-with-aliens.html?full=true \|title=Why the universe may be teeming with aliens \|date=2008-11-19 \|accessdate=2009-11-19 \|last=Shiga \|first=David \|work=Space \|publisher=NewScientist}} {{astronomi-stub}}

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