Describe the difference between an typical galaxy and a quasar?
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Our galaxy, the Milky Way, has somewhere between 100 billion and 400 billion stars (it's difficult to estimate precisely). However, it's not really "typical"; it has more stars than any other galaxy in the "Local Group" except for the Andromeda Galaxy, which has about a trillion stars. I'm not sure there really is such a thing as a "typical" galaxy.