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Messier object - Wikipedia
Charles Messier - Wikipedia
Hubble's Messier Catalog - Science@NASA
The Messier Catalog: A List of Messier Objects | StarLust
Messier Catalogue - Messier Objects
Charles Messier | Comet Discoverer, Deep-Sky Objects
Messier Objects – Constellation Guide
Charles Messier - NASA Science
EarthSky | What are Messier objects?
Messier 1 (The Crab Nebula) - NASA Science