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2. Messier 75 - Wikipedia

   en.wikipedia.org/wiki/Messier_75

   Messier 75 is part of the Gaia Sausage, the hypothesized remains of a dwarf galaxy that merged with the Milky Way. [10] It is a halo object with an orbital period of 0.4 billion years to travel around the galaxy on a very pronounced ellipse, specifically eccentricity of 0.87. The apocenter (maximal distance from Earth) is about 57,000 ly ...

3. Wikipedia:WikiProject Astronomical objects/Catalogues/Messier ...

   en.wikipedia.org/.../Catalogues/Messier_Catalogue

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4. Messier object - Wikipedia

   en.wikipedia.org/wiki/Messier_object

   The Messier catalogue is one of the most famous lists of astronomical objects, and many objects on the list are still referenced by their Messier numbers. [1] The catalogue includes most of the astronomical deep-sky objects that can be easily observed from Earth's Northern Hemisphere; many Messier objects are popular targets for amateur ...

5. Category:Messier objects - Wikipedia

   en.wikipedia.org/wiki/Category:Messier_objects

   use [[Category:Messier objects|###]], dropping the M prefix, and using only the number. The number should be padded up to 3 digits using zeroes. Articles without the Messier number in the title use [[Category:Messier objects]]. A redirect containing the Messier number should also be added to the category, sorted as above.

6. Messier 54 - Wikipedia

   en.wikipedia.org/wiki/Messier_54

   Messier 54 (also known as M54 or NGC 6715) is a globular cluster in the constellation Sagittarius. [ a ] It was discovered by Charles Messier in 1778 and then included in his catalog of comet -like objects.

7. Shapley–Sawyer Concentration Class - Wikipedia

   en.wikipedia.org/wiki/Shapley–Sawyer...

   The Shapley–Sawyer Concentration Class is a classification system on a scale of one to twelve using Roman numerals for globular clusters according to their concentration. . The most highly concentrated clusters such as M75 are classified as Class I, with successively diminishing concentrations ranging to Class XII, such as Palomar