In the past, measures of “Earth-likeness” of #exoplanets have been qualitative, considered an abiotic Earth, or required discretionary choices of what makes a #planet Earth-like.
With the advent of high-resolution spectroscopy, there is a growing need for a method of quantifying the Earth-likeness of a planet.
Now, astronomers introduce an informational-entropic metric that makes use of the spectrum of an exoplanet to directly quantify how Earth-like the planet is.
astrobiology.com/2025/04/an-in…
An Informational-Entropic Approach to Exoplanet Characterization - Astrobiology
In the past, measures of ``Earth-likeness'' of exoplanets have been qualitative, considered an abiotic EarthKeith Cowing (Astrobiology)
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