'Habitable zone' redefined for alien planets - NBCNews.com
URL: http://www.nbcnews.com/id/50628915/ns/technology_and_science-space/
Submitted: Wed Jan 30 2013
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CT: UFOSeek News 2013: 'Habitable zone' redefined for alien planets - NBCNews.com
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'Habitable zone' redefined for alien planets