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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.
Distance Indicators. Measuring the distance to a galaxy almost always involves one of the following properties of the propagation of light: (1) The apparent brightness of a source falls of inversely with the square of its distance; (2) The angular size of a source falls off inversely with its distance.