I think the proper term is circumstellar habitable zone. If there is other life out there, why are we assuming that it’ll have the same basic needs as our animals? The universe is seemingly infinite, and there’s endless possibilities of what’s out there, so why do we only consider planets that are the ‘perfect’ distance away from their star?
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Chemistry operates on the rules of physics which are universal regardless of the location. Life requires many complex chemical reactions to take place in order to exist. While it is possible, it is incredibly unlikely that life could develop somewhere without liquid water to slosh around and slam molecules together until they happen to make proteins and then slam those together until they make amino acids and so forth.
We have such incredibly finite resources to use, it would be a waste using them to look at places that can’t happen. The odds of life developing without liquid water is just infinitesimal.
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