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Messier 13, or M13 (also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules, the Hercules Globular Cluster, or the Great Hercules Cluster), is a globular cluster of several hundred thousand stars in the constellation of Hercules.
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 ...
The first known globular cluster, now called M 22, was discovered in 1665 by Abraham Ihle, a German amateur astronomer. [4] [5] [6] The cluster Omega Centauri, easily visible in the southern sky with the naked eye, was known to ancient astronomers like Ptolemy as a star, but was reclassified as a nebula by Edmond Halley in 1677, [7] then finally as a globular cluster in the early 19th century ...
List of largest known star clusters Cluster name Diameter (light-years) Type of cluster Notes Terzan 7: 316 [1] Globular cluster: Messier 54: 306 [2] NGC 339: 238 [3] Messier 3: 226 [4] Messier 11 (Wild Duck Cluster) 190 [5] Open cluster: Messier 2: 174.4 [6] Globular cluster: Omega Centauri: 172 ± 12 [7] Largest globular cluster in the Milky ...
Image taken by ESO's VISTA of the Globular Cluster VVV CL001. On the right lies the globular star cluster UKS 1 and on the left [where?] lies a much less conspicuous new discovery, VVV CL001. [1] The two are not physically located close to each other; this is a line-of-sight coincidence. [2] This is a list of globular clusters.
Messier 13; Hercules Globular Cluster Globular cluster: Hercules: 16 h 41 m 41 s ... 7.2 6712: Globular cluster: Scutum: 18 h 53 m 04.3 s: −08° 42′ 22″ 9.9 ...
The Arecibo message is an interstellar radio message carrying basic information about humanity and Earth that was sent to the globular cluster Messier 13 in 1974. It was meant as a demonstration of human technological achievement, rather than a real attempt to enter into a conversation with extraterrestrials. [1] [2]
A few of the brightest globular clusters are visible to the naked eye; the brightest, Omega Centauri, was observed in antiquity and catalogued as a star, before the telescopic age. The brightest globular cluster in the northern hemisphere is M13 in the constellation of Hercules.