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I watch with interest, most threads regarding the possibility of life, I think to humans curiosity is just the most natural thing.
Habitable zone really just refers to the temperature requirements of liquid water, not much else.
So many factors are required for our life to exist, an automatic assumption that life is there on this planet inferred or otherwise is awesomely optimistic, and really is just a headline grabber, nothing else.
Mars had water, for a long time too. It's not that far away, yet we can't determine with any accuracy does it/ did it have life. So clearly trying to determine such for a planet 20 light years away presents some difficulties.
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