I always wonder how anyone can determine what the necessary parameters would be for life to exist on another planet. Our sample size of habitable planets is 1. That’s hardly a sufficient sample size from which to make any generalizations about what is necessary for life to exist.
Even though our sample size of planet is ‘1’, our sample size of habitats is huge. From freezing mountaintops to the bottom of the oceans in darkness and humongous pressures and temps that would boil a lobster, we have found ‘life’ in many forms that would make space aliens look tame..............