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$f_p$ Represents the average \textbf{average  number of planets around a star. 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