Life and Planetary Habitability — Working Two Ways?
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It looks like requirements for habitability on extrasolar planets are getting more complicated, even mystical. The planetary habitable zone concept was simple, where water was a must , the right kind of star, proper distance from it, and a few others to make the Goldilocks Zone. Not only are hopes of finding lucky planets in that zone dimming , there is speculation that for a planet to be able to support life, it must have life. Sounds like the concept is folding in on itself, but it is being considered. HD 149026b (Smertrios), NASA / JPL-Caltech / T. Pyle (SSC) (usage does not imply endorsement of site contents) Study on it a spell: Living things have an impact on their environments. (For example, beavers help ecosystems and supposed climate change . Also, creatures under the ground have tremendous effects.) Researchers examined the energy that critters produce, which is significant — and it was from a limited number. Someone wondered if the need for an ecosystem is an ar...