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Messier 21 or M21, also designated NGC 6531 or Webb's Cross, is an open cluster of stars located to the north-east of Sagittarius in the night sky, close to the Messier objects M20 to M25 (except M24). It was discovered and catalogued by Charles Messier on June 5, 1764. [7] This cluster is relatively young and tightly packed.
The Messier catalogue comprises nearly all of the most spectacular examples of the five types of deep-sky object – diffuse nebulae, planetary nebulae, open clusters, globular clusters, and galaxies – visible from European latitudes. Furthermore, almost all of the Messier objects are among the closest to Earth in their respective classes ...
See also: Globular cluster, List of globular clusters Messier 107 or M107 , also known as NGC 6171 or the Crucifix Cluster , is a very loose globular cluster in a very mildly southern part of the sky close to the equator in Ophiuchus , and is the last such object in the Messier Catalogue .
3 Messier 1-110. Toggle the table of contents. Wikipedia: WikiProject Astronomical objects/Catalogues/Messier Catalogue. Add languages. Add links. Project page; Talk;
NASA Astronomy Picture of the Day: Globular Cluster M22 from CFHT (27 June 2005) NASA Astronomy Picture of the Day: M22 and the Wanderers (April 12, 2018) Merriefield, Mike. "M22 – Globular Cluster". Deep Sky Videos. Brady Haran. Messier 22 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Messier 15 or M15 (also designated NGC 7078 and sometimes known as the Great Pegasus Cluster) is a globular cluster in the constellation Pegasus. It was discovered by Jean-Dominique Maraldi in 1746 and included in Charles Messier 's catalogue of comet -like objects in 1764.
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Messier 34 (also known as M34, NGC 1039, or the Spiral Cluster) is a large and relatively near open cluster in Perseus. It was probably discovered by Giovanni Batista Hodierna before 1654 [ 4 ] and included by Charles Messier in his catalog of comet -like objects in 1764.