The list of Messier objects (created initially by Charles Messier) is often simply referred to numerically as M1, M2, etc. Visual observers will often in the spring (when this is possible) partake in a "Messier Marathon" where they attempt to observe the entire list in a single night.

This is my own personal photographic Messier Marathon, and it's years in the making and still ongoing. Many of these images are old, and show my inexperience as I was learning the ropes. 

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