Stephen H. Doyle, in Habitable Planets for Man, attempted to estimate the abundance of planets in which human beings could live without life-support systems such as domes or spacesuits. He estimated that there were something like 600 million human-habitable planets in our galaxy alone. Other galaxies should have comparable numbers.
Stanley Schmidt, Aliens and Alien Societies, 1995
Stanley Schmidt, Aliens and Alien Societies, 1995
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