"Mars is believed to be lifeless, but it may be possible to transform it into a planet suitable for habitation by plants, and conceivably by humans" // Making Mars Habitable, Chris McKay, Owen B. Toon, James Kasting, 1991 http://lunar.earth.northwestern.edu/courses/438/mckay1991.pdf …
11:08 AM - 7 Mar 2018
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