The number of planets in the Milky Way galaxy which could harbor complex life may be as high as 100 million, according to WSU astrobiologist Dirk Shultze-Makuch and a team of researchers from Cornell and the University of Puerto Rico. It is the first quantitative estimate of the number of worlds in our galaxy that could harbor life above the microbial level, based on objective data.
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Shultze-Makuch’s column on the Air & Space/Smithsonian website