The Earth Similarity Index (ESI) is a proposed character... - dofaq.co
earth similarity index

The Earth Similarity Index (ESI) is a proposed character...

wikipedia - 26 Jul 2015
The Earth Similarity Index (ESI) is a proposed characterization of how similar a planetary-mass object or natural satellite is to Earth. It was designed to be a scale from zero to one, with Earth having a value of one; this is meant to simplify planet comparisons from large databases. It has no quantitative meaning for habitability.

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