  In the past ten years this author published some 15 highly mathematical
papers about his new Evo-SETI (Evolution and SETI) Theory. He proved that key
features of Evo-SETI are: 1) The Statistical Drake Equation is the extension of
the classical Drake equation into Statistics. Probability distributions of the
number of ET civilizations in the Galaxy are given, and so is the probable
distribution of the distance of ETs from us. 2) Darwinian Evolution is
re-defined as a Geometric Brownian Motion (GBM) in the number of living species
on Earth over the last 3.5 billion years. Its mean value grows exponentially in
time and Mass Extinctions of the past are accounted for as unpredictable low
GBM values. 3) The exponential growth of the number of species during Evolution
is the geometric locus of the peaks of a one-parameter family of lognormal
distributions constrained between the time axis and the exponential mean value.
This accounts for cladistics. 4) The lifespan of a living being, let it be a
cell, an animal, a human, a historic human society, or even an ET society, is
mathematically described as a finite b-lognormal. This author then described
mathematically the historical development of eight human historic
civilizations, from Ancient Greece to the USA, by virtue of b-lognormals. 5)
The b-lognormal's entropy is the measure of a civilization's advancement level.
By measuring the entropy difference between Aztecs and Spaniards in 1519, this
author was able to account mathematically for the 20-million-Aztecs defeat by a
few thousand Spaniards, due to the latter's technological superiority. Now:
whenever a new exoplanet is discovered, where does that exoplanet stand in its
evolution towards life as we have it on Earth nowadays, or beyond? In this
paper we provide mathematical criteria to answer this question within the
framework of the Evo-SETI Theory, thus creating the EVO-SETI SCALE.
