Tuesday, September 25, 2018

Xeno-biology (part 2)


One assumption that we humans have about life is that it must exist where water is available. We even have classified a range of space in a solar system that we consider a “habitable zone,” which is an area around a star where a planetary surface can support liquid water under certain atmospheric pressure. When we scan the cosmos for potential life, we bring our bias with us and only consider planets that fall inside this zone as capable of supporting life. Yet the very premise of xeno-biology is the consideration of life beyond the parameters we know, so why are we limiting ourselves to this perspective? The answer is that it is the most likely place to start—we must start with what is most familiar and, from our experience, the most plausible. If a planet does not have water, then we move on to consider other, more likely candidates for life. Considering the enormous number of planets out there in the cosmos, it makes perfect sense to do this. But...what if we are missing something?

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