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The Milky Way contains somewhere around 200 billion stars. These stars account for about 20% of the visible mass of the galaxy, the other 80% being interstellar gas.

However, most of the matter in our galaxy is of a form we have not yet identified, and we call it "dark matter." We don't know what it is, but we can measure its effect on the rotation rate of the stars, and we can calculate the distribution of the dark matter.

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15y ago

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