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Charles Messier discovered the Whirlpool Galaxy on October 13, 1773

Space.com also calls the Whirlpool Galaxy Messier 51, or M51, and points to why its discovery mattered.

1 Source, 20d ago, first seen 20d ago

TLDR

Space.com marks the October 13 anniversary of French astronomer Charles Messier's 1773 discovery of the Whirlpool Galaxy, also known as Messier 51 or M51. Its post points readers to an explanation of why the discovery mattered.

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1 Source, first seen 20d ago