Number of Stars with Habitable Planets. Assume that the Milky Way Galaxy has 300 billion stars (a reasonable estimate). Based on the statistics given in this chapter, determine approximately how many stars would be Sun-like. How many would be K stars? How many would be M stars? If you assume that an average G star has one planet in its habitable zone, while only one in five K stars and one in ten M stars has such a planet, how many total planets would you expect to find in habitable zones in the Milky Way Galaxy?
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