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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.
National Center for Advanced Manufacturing "Michoud Assembly Facility". GlobalSecurity.org. Historic American Engineering Record (HAER) No. LA-24, "Michoud Assembly Facility, 13800 Old Gentilly Road, New Orleans, Orleans Parish, LA", 49 photos, 8 measured drawings, 81 data pages, 9 photo caption pages
Messier 23, also known as NGC 6494, is an open cluster of stars in the northwest of the southern constellation of Sagittarius. [7] It was discovered by Charles Messier in 1764. [ a ] [ 3 ] It can be found in good conditions with binoculars or a modestly sized telescope . [ 3 ]
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 30 (also known as M30, NGC 7099, or the Jellyfish Cluster) is a globular cluster of stars in the southeast of the southern constellation of Capricornus, at about the declination of the Sun when the latter is at December solstice.
A Messier marathon is an attempt, usually organized by amateur astronomers, to find as many Messier objects as possible during one night. The Messier catalogue was compiled by French astronomer Charles Messier during the late 18th century and consists of 110 relatively bright deep-sky objects ( galaxies , nebulae , and star clusters ).
NASA Astronomy Picture of the Day: M46 and NGC 2438: Young and Old (5 March 1999) NASA Astronomy Picture of the Day: Stars Young and Old (26 March 2009) – featuring M46; NASA Astronomy Picture of the Day: M64 Plus Two (17 April 2015) Messier 46 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Messier 56 (also known as M56 or NGC 6779) is a globular cluster in the constellation Lyra. [ a ] It was discovered by Charles Messier in 1779. [ b ] It is angularly found about midway between Albireo (Beta (β) Cygni) and Sulafat (Gamma (γ) Lyrae).