Superhabitable worlds.

@article{Heller2014SuperhabitableW,
  title={Superhabitable worlds.},
  author={Ren{\'e} Heller and John Thomas Armstrong},
  journal={Astrobiology},
  year={2014},
  volume={14 1},
  pages={
          50-66
        }
}
To be habitable, a world (planet or moon) does not need to be located in the stellar habitable zone (HZ), and worlds in the HZ are not necessarily habitable. Here, we illustrate how tidal heating can render terrestrial or icy worlds habitable beyond the stellar HZ. Scientists have developed a language that neglects the possible existence of worlds that offer more benign environments to life than Earth does. We call these objects "superhabitable" and discuss in which contexts this term could be… 
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