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The Milky Way is the second-largest galaxy in the Local Group, with its stellar disk approximately 100,000 ly (30 kpc) in diameter, and, on average, approximately 1,000 ly (0.3 kpc) thick.
To determine the distance to a galaxy, we take the absolute luminosity of one of the distance indicators within the galaxy and its observed apparent brightness. Then, using the inverse-square law of brightness, we find the distance by way of the distance modulus (m-M), as described in Section 13.2.