The Hercules Cluster (Abell 2151) is a cluster of about 100 galaxies some 650 million light-years distant (z = 0. The Abell catalogue is an almost complete catalogue of approximately 4000 Galaxy clusters with at least 30 members to a Redshift of z = 0 Galaxy groups and clusters are the largest Gravitationally bound objects to have arisen thus far in the process of cosmic structure formation A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by In Physics and Astronomy, redshift occurs when Electromagnetic radiation – usually Visible light – emitted or reflected by 036^[3]) in the constellation Hercules. In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Hercules (ˈhɝkjəliːz ˈhɝkjuːliːz is the fifth largest of the 88 modern Constellations It was also one of Ptolemy 's 48 constellations It is rich in spiral galaxies and shows many interacting galaxies. A spiral galaxy is a Galaxy belonging to one of the three main classes of galaxy originally described by Edwin Hubble in his 1936 work “The Realm of the Interacting galaxies ( Colliding galaxies) are the result of one Galaxy 's Gravity disturbing another galaxy ^[4] The cluster is part of the larger Hercules supercluster, which is itself part of the much larger Great Wall super-structure. The Great Wall (also called Coma Wall) sometimes specifically referred to as the CfA2 Great Wall, is the second largest known super-structure in the In Physical cosmology, the term large-scale structure refers to the characterization of observable distributions of Matter and Light [1]

External links

• July 19, 2007 — Astronomy Picture of the Day
• Hercules Cluster — University of Alabama
• The Hercules Cluster on the WikiSky: DSS2, SDSS, IRAS, Hidrogen α, X-Ray, Astrophoto, Sky Map

References

1. ^ ^{a b} NASA/IPAC Extragalactic Database. The Astronomy Picture of the Day ( APOD) Website is a service provided by NASA and Michigan Technological University (MTU Results for Abell 2151. Retrieved on 2007-07-19. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 711 - Muslim forces under Tariq ibn Ziyad defeat the Visigoths led by their king Roderic.
2. ^ National Optical Astronomy Observatory. Galaxies. Retrieved on 2007-07-19. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 711 - Muslim forces under Tariq ibn Ziyad defeat the Visigoths led by their king Roderic.
3. ^ Two Micron All Sky Survey. 2MASS Galaxy Science & Analysis. Observations for the Two Micron All-Sky Survey ( 2MASS) began in 1997 and were completed in 2001 at two Telescopes located one each in the northern and Retrieved on 2007-08-03. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 8 - Roman Empire General Tiberius defeats Dalmatians on the river Bathinus.
4. ^ University of Alabama Astronomy. Astronomical Image Galleries. Retrieved on 2007-07-19. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 711 - Muslim forces under Tariq ibn Ziyad defeat the Visigoths led by their king Roderic.