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How do astronomers know how many stars are in the Milky Way?

April 26, 2017astronomers milky way stars

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How do astronomers know how many stars are in the Milky Way?

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(Mary, Springfield, Illinois) A: The main way we calculate the number of stars in the Milky Way sounds simple. We determine the mass of our galaxy, and then divide by the mass of our Sun. That gives us the number of Sol-mass stars in the galaxy.