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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