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$f_p$ Represents the \textbf{average number of planets around a star}.   %We now know that, in average, there is one planet orbiting every star in the Universe. To put it in the words of W. %Borucki, Principal Investigator of the KEPLER satellite: "When you wish upon a star, you are wishing upon a star with %planets". So $f_p \approx$ 1  We now know that, in average, there is one planet orbiting every star in the Universe. Universe \citep{2013ApJ...764..105S,2012Natur.481..167C}.  Just in our Galaxy this means we have 100 billions planets. Since we have about 100 billion galaxies in the Universe, there are about 10,000,000,000,000,000,000,000 =$10^{22}$ planets out there. To put it in the words of W. Borucki, Principal Investigator of the KEPLER satellite: "When you wish upon a star, you are wishing upon a star with planets" \citep{2013ApJ...764..105S,2012Natur.481..167C}. planets".  So $f_p \approx$ 1