the planet Gliese 581g, located about twenty light years from the Solar System, appeared to have certain characteristics that, very roughly, I married into the Earth. Primarily, and not much else, given the relatively small and, more importantly, to be located within the "habitable zone" your system, dominated by a modest red star. That meant neither more nor less than it would be a world where temperatures may be warm enough to allow air through (another assumption), the presence of liquid water on the surface. And eventually, with the help of the above, be a suitable stage (just fits) for life. Nothing more. However, here and there, the term "planet habitable" was distorted and twisted to the utmost. And he heard things like Gliese 581g "seemed to be inhabited," or that "we could go to inhabit" (because it was "habitable") much or more foolish thing. Distortions. Annoying noise in the signal. Nothing so serious, not so new, in communication of science news. 
The full article, here.
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