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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.
For example, the distance to the next nearest big galaxy, the Andromeda Galaxy, is 21 quintillion km. That's 21,000,000,000,000,000,000 km. This is a number so large that it becomes hard to write and hard to interpret. So astronomy we use other units of distance.like LIGHT YEAR, PARSEC , ASTRONOMICAL UNIT. In our solar system, we tend to describe distances in terms of the Astronomical Unit (AU)(1 ly =63, 235AU ).