The Rare Earth Equation

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Can you name the factors that make up the Rare Earth Equation?

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FactorAbbreviationWard/Brownlee/Gonzalez estimate
Number of earth-like planets in Milky Way having complex lifeforms
Number of stars in the Milky Way
Number of planets in a star's habitable zone
Fraction of stars in galactic habitable zone
Fraction of stars with planets
Fraction of rocky (not gaseous) planets
Fraction of habitable planets where microbial life arises
Fraction of planets where complex life evolves
Fraction of lifespan of planet where complex life present
Fraction of habitable planets with large moon
Fraction of star systems with Jupiter-like planets
Fraction of planets with sufficiently low extinction events

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