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Suppose there are 12000.0 civilizations broadcasting radio signals in the Milky Way Galaxy at the moment....

Suppose there are 12000.0 civilizations broadcasting radio signals in the Milky Way Galaxy at the moment. On average, how many stars would have to be searched before a signal is heard? Assume that there are 5 × 1011 stars in the Galaxy and one civilization per star
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Answer #1

Number of stars to be searched before a signal is heard is

N = (Number of stars)/(Number of civilizations)

N=(5*1011)/12000

N=4.1667*107

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