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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It’s a bit like looking for a doctor in a hospital. Any person could be a doctor; people wearing “normal” clothes could be a doctor coming on/off their shift. But if you’re looking for a doctor, you’re going to run towards the person who’s dressed in a white or blue coat (maybe with a stethoscope on their neck) because that’s what you **know** doctors look like.
Likewise, any planet could harbor life. But we **know** that life can exist under the “Goldilocks” conditions, so we know that if we’re looking there, we at least have a chance of finding it. We don’t have the resources to look everywhere all the time, so we have to prioritize where we have the best chances.
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