NATS 1880 Lecture Notes - Lecture 12: Tesla Coil, Encephalization Quotient, Ionosphere
25 Jun 2017
School
Department
Course
Professor
Document Summary
Drake equation: 1961 frank drake equation guesses # of intelligent civilizations. Equation: number of civilizations = nhp x flife x fciv x fnow. Nhp: number of habitable planets in galaxy (100 b stars in our galaxy)* Flife: fraction of life bearing planets/all planets in galaxy. Fciv: fraction of civilization bearing planets at some point/all planets in galaxy. Fnow: fraction of civilization present today/all planets in galaxy. Problem: we don"t know the precise value for any of these terms! * easiest & hardest factor: n_hp (easy) & f_now (hard) Primary factor: the lifetime of civilizations is the most important factor in the search. Early drake equation: n = r* x fp x ne x x x fc x l. R* = number of stars formed in galaxy in each year. Fp = fraction of stars having planets. Ne = number of planet per system capable of supporting life. = fraction of planet on which live evolved.
