Omega Centauri

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  • noun

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a global cluster in the constellation Centaurus

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lt;div class="caption">Colorful Stars Galore Inside Globular Star Cluster Omega Centauri NASA's Hubble Space Telescope snapped this panoramic view of a colorful assortment of 100,000 stars residing in the crowded core of a giant star cluster.
Unlike other star clusters, whose members all have similar age and chemical makeup, Omega Centauri displays a wide range of age and chemistry, from the ancient (12 billion years) to the relatively recent.
The presence of different stellar populations suggests that Omega Centauri is not, in fact, a globular cluster, but the remnant core of a dwarf galaxy torn to shreds by the Milky Way's gravity.
John Herschel was a meticulous observer and skilled draughtsman and using the 20-foot telescope made several observations of Omega Centauri during his time at the Cape between 1834 and 1837.
Paul and Liz Downing, from their observatory in southern Spain (latitude 36[degrees] 51' 42" N, longitude 3[degrees] 15m 30s W--see Journal 117(6), 2007), are able to observe both globulars--albeit with Omega Centauri considerably closer to the horizon--and their images, made at the same scale, are shown here.
In fact the generally accepted diameter for Omega Centauri is 55 arcmin compared to only 21 for M13.
She commented that Omega Centauri, although close to the horizon, appeared huge and seemed much larger than twice the diameter of M13--a uniformly bright sphere with an indistinct edge.
The globular star cluster Omega Centauri has caught the attention of sky watchers ever since the ancient astronomer Ptolemy first catalogued it 2,000 years ago.
Identified as a globular star cluster in 1867, Omega Centauri is one of roughly 150 such clusters in our Milky Way Galaxy.
The central region of the globular cluster Omega Centauri (pictured here) occupies a region of the Milky Way some 17,000 light-years from Earth and houses nearly a million stars.
She says that Omega Centauri may have collided at some earlier time with another cluster to create the mix of ultraviolet intensities and the lower-than-expected core density apparent in the globular cluster today.
Munich, Dec 3 (ANI): New observations of the celestial giant Omega Centauri, have suggested that there is a medium sized black hole sitting at its centre, which has made astronomers suggest that the galaxy might be an impostor.
Appearing nearly as large as the full moon on the southern night sky, Omega Centauri is visible with the unaided eye from a clear, dark observing site.
The presence of this black hole is just one of the reasons why some astronomers suspect Omega Centauri to be an imposter.
The false-color photograph is a computer-enhanced image of stars near the center of the bright globular cluster Omega Centauri (inset).