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How many stars would we have to search

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Suppose there are 1.2 × 104 civilizations broadcasting radio signals in the Milky Way Galaxy right now.

Part A - On average, how many stars would we have to search before we would expect to hear a signal? Assume there are 500 billion stars in the galaxy.

Express your answer using two significant figures.

Part B - How does your answer change if there are only 110 civilizations instead of 1.2 × 104?

Express your answer using two significant figures.

Reference no: EM131128487

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