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Plant Possibilities. Suppose that only one in a million stars is orbited by an Earth-like planet....

Plant Possibilities. Suppose that only one in a million stars is orbited by an Earth-like planet. (A) If there are 100 billion stars in the Milky Way Galaxy, how many Earth-like planets are there in the galaxy? (B) If there are 100 billion galaxies in the observable universe, how many Earth-like planets are there in the observable universe?

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