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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.
As globular cluster M13, at which the message was aimed, is more than 25,000 light-years from Earth, the message, traveling at the speed of light, will take at least 25,000 years to arrive there. By that time, the core of M13 will no longer be in precisely the same location because of the orbit of the star cluster around the Galactic Center. [2]
Hercules contains two bright globular clusters: M13, the brightest globular cluster in the northern hemisphere [dubious – discuss], and M92. It also contains the nearly spherical planetary nebula Abell 39. M13 lies between the stars η Her and ζ Her; it is dim, but may be detected by the unaided eye on a very clear night.
The Hercules Cluster (Abell 2151) is a cluster of about 200 galaxies [4] some 500 million light-years distant in the constellation Hercules. It is rich in spiral galaxies and shows many interacting galaxies. [5] The cluster is part of the larger Hercules Supercluster, which is itself part of the much larger Great Wall super-structure. [6]
Messier 13; Hercules Globular Cluster Globular cluster: Hercules: 16 h 41 m 41 s +36° 27′ 37″ 5.8 6207: UGC 10521 MCG 6-37-7 ZWG 197.7 PGC 58827 KUG 1641+369 IRAS16412+3655 KARA 766 Uppsala 10521 Spiral galaxy: Hercules: 16 h 43 m 03.7 s +36° 49′ 57″ 11.7 ± 0.4 6210: Planetary nebula: Hercules: 16 h 44 m 29.5 s +23° 48′ 00″ 12.3 ...
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 Lockheed C-130 Hercules is a versatile workhorse plane with a spacious cargo hold that can be equipped for a wide range of operations. When deployed as a firefighting aircraft, the C-130 can ...
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.