CHANCE OF FINDING A HABITABLE PLANET This list appears to omit what is possibly

CHANCE OF FINDING A HABITABLE PLANET

This list appears to omit what is possibly the most important criteria:

“Fraction of those planets with a molten iron core, and a moon large enough to keep it molten, so that an electromagnetic shield can protect the atmosphere.”

Rate of star formation, R” = 1 solar masses

Fraction of stars with planets, fp = 1

Number of habitable planets per star, ne = 4

Fraction of those planets that develop life, fl = 0.25

Fraction of the above that develop intelligent life, fi = 1

Fraction of planets with intelligent life that send signals into

space, to = 1

Lifetime of a civilisation that sends signals into space, L = 100