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M51a or NGC 5194 is a spiral galaxy with an active nucleus

Its distance is estimated between 15 and 35 million light-years.
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The Whirlpool Galaxy, also known as Messier 51a, M51a, and NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus. It lies in the constellation Canes Venatici, and was the first galaxy to be classified as a spiral galaxy.Its distance is estimated to be between 15 and 35 million light-year.

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