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Topic: Globular cluster


  
 [No title]   (Site not responding. Last check: 2007-10-22)
Globular clusters are usually composed of hundreds of thousands of old stars, similar to the bulge of a spiral galaxy but confined to a volume of only a few cubic parsecs.
Globular clusters are fairly numerous; there are about 150 currently known globulars of the Milky Way (with perhaps 30-50 more undiscovered), and larger galaxies like Andromeda have more (Andromeda may have as many as 500).
Such globular clusters may be the former nuclei of galaxies that once orbited their host galaxy, but were totally engulfed and tidally stripped of their stars save for the dense nucleus.
wikiwhat.com /encyclopedia/g/gl/globular_cluster.html   (535 words)

  
 globular cluster
Unlike open clusters and stellar associations, which are held together only weakly by gravity and contain Population I objects, globulars are tightly gravitationally bound collections of Population II stars.
Further evidence that globular clusters are not necessarily relics of the earliest generations of stars in a galaxy comes from observations of galaxy collisions.
One of the nearest globular clusters, M13 (the Great Cluster in Hercules), was the target for an early attempt at CETI, though whether planets exist within globulars clusters is still a matter of debate.
www.daviddarling.info /encyclopedia/G/globclust.html   (591 words)

  
 Reference.com/Encyclopedia/Globular cluster
Globular clusters are generally composed of hundreds of thousands of old stars, similar to the bulge of a spiral galaxy but confined to a volume of only a few cubic parsecs.
Globular clusters normally consist of Population II stars, which have a low metallicity compared to Population I stars such as the Sun.
Globular cluster formation is prevelant in starburst regions and in interacting galaxies.
www.reference.com /browse/wiki/Globular_cluster   (3521 words)

  
 Globular Star Clusters
Globular clusters are gravitationally bound concentrations of approximately ten thousand to one million stars, spread over a volume of several tens to about 200 light years in diameter.
Globular clusters typically contain a number of variable stars, in particular RR Lyrae stars which were once called "Cluster Variables" because of their abundance in globulars.
It is perhaps a bit surprising that almost all globular clusters seem to be of about the same age; there seems to be a physical reason that they all formed in a short period of time in the history of the universe, and this period was apparently long ago when the galaxies were young.
www.seds.org /messier/glob.html   (2112 words)

  
 Encyclopedia Galactica - Gi to Gn - Human (Anglic) Revised 351st Edition
Globular clusters can measure up to several hundred light years in diameter.
Like most astronomical objects, globular clusters exhibit a range of characteristics, but certain features are common to a majority of them.
These are believed to have formed early in the history of the Galaxy and contain some of the most ancient stars known; possibly 12 billion years or so old (cf.
www.orionsarm.com /eg/g/Gi-Gn.html   (1416 words)

  
 Great Globular Cluster in Hercules - Voyager, the free encyclopedia   (Site not responding. Last check: 2007-10-22)
Messier Object 13, the Great Globular Cluster in Hercules; one of the most prominent and best known globular clusters of the Northern celestial hemisphere.
The Great Globular Cluster in Hercules (also known as the Hercules Globular Cluster, Messier Object 13, Messier 13, M13, or NGC 6205) is a globular cluster in the Hercules constellation at right ascension 16
The Arecibo message of 1974 was transmitted toward this globular cluster.
voyager.in /Messier_Object_13   (185 words)

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