Estimate the mass of the Milky Way Galaxy from the fact that the Sun orbits the galactic center every 230 million years at a distance of 27,000...
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Estimate the mass of the Milky Way Galaxy from the fact that the Sun orbits the

galactic center every 230 million years at a distance of 27,000 light-years. (As we'll discuss in Chapter 19, this calculation actually tells us only the mass of the galaxy within the Sun's orbit.)

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