NGC 7331 is located 43 million light-years away. Its diameter is about 120,000 light-years. It has a well-defined spiral structure. Images of NGC 7331 are often used to illustrate the likely appearance of the Milky Way. The galaxy's angular size is 10.2 by 4.2 arcminutes. It is the brightest object not included in the Messier catalog.
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