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The Whirlpool Galaxy (Whirlpool Galaxy), also known as Messier 51a (M51a), is a distinctly structured spiral galaxy. Although it resembles the Milky Way in structure, it is one of the few external galaxies that can be observed relatively easily and whose structural features can be clearly distinguished. Location of Messier 51. (NASA) " image-element-format="justify" image-source="https://cdn.t3pedia.org/media/uploads/2025/07/09/6falsmnAPG8pfLfLVsOUubjA27ZuqNj2.webp"> First observed in 1773 by

The Whirlpool Galaxy, also known as Messier 51a (M51a), is a prominent spiral galaxy. Although it resembles the Milky Way in building, it is one of the rare galaxies among external galaxies that can be relatively easily observed and whose structural features are clearly distinguishable. NASA. "Messier 51 (The Whirlpool Galaxy)." NASA Science. Location of Messier 51. First observed in 1773 by Charles Messier, M51 entered the history of astronomy as one of the earliest examples demonstrating the e