A Two-Tier Framework for Exoplanet Habitability: Earth Similarity Index and Planetary Habitability Index

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A two-tier framework screens exoplanets by first measuring Earth-like similarity through mass, radius, and temperature, then evaluating overall habitability with a Planetary Habitability Index that requires a stable substrate, available energy, suitable chemistry, and a liquid solvent, designed to minimize Earth-life bias and to improve as new data and missions become available.

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A two-tiered approach to assessing the habitability of exoplanets - PubMed
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A two-tiered approach to assessing the habitability of exoplanets - PubMed

In the next few years, the number of catalogued exoplanets will be counted in the thousands. This will vastly expand the number of potentially habitable worlds and lead to a systematic assessment of their astrobiological potential. Here, we suggest a two-tiered classification scheme of exoplanet hab …