Globular Star Cluster
Globular clusters are large spherical groups of older stars bound together by gravity. These clusters contain from ten thousand to one million stars and are distributed in a spherical "halo" around the galaxy.
Globular Star Cluster
A star cluster containing 50,000 to 1 million stars in a sphere about 75 light years in diameter; generally old metal poor and found in the spherical component of the galaxy.
Graben Rille ...
M13 globular star cluster
Gravitational field demonstrated
Self-gravitating system
A self-gravitating system is a system of masses kept together by mutual gravity. An example is a star.
giant globular star cluster in the northern constellation Hercules; cataloged as M13 or NGC 6205. The cluster is just visible to the naked eye and is the best example of a globular cluster visible in the Northern Hemisphere.
Globular star clusters are harder to find. They are intrinsically larger, but they are also much farther away and therefore appear smaller in the sky.
M53 is a globular star cluster one degree northeast of alpha Comae. The brightest Messier in the constellation (7.7), it tends to be most impressive with larger telescopes, which are needed to resolve the individual stars.
This small globular star cluster in Sagittarius was discovered by Messier on July 27, 1764. It is about 15,000 ly distant and measures 65 ly across. M28 is visible in binoculars just 1° NW of l Sagittarii (see finder chart below).
Distribution of globular star clusters in the Milky Way
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GLOBULAR CLUSTER
A globular star cluster is a spherical group of up to a million stars held together by gravity. These remote objects lie mostly around the central bulge of spiral galaxies.
In 1974, Frank Drake and his colleagues used the gigantic radio telescope at Arecibo, Puerto Rico to beam an elaborate coded message in the direction of a globular star cluster (a cluster of millions of stars) called M13.
The famous globular star cluster omega Cen (NGC 5139) is the largest and brightest in the sky. It takes an area on the sky even larger than the full Moon.
The great Southern Treasures -- the Southern Cross and the Omega Centauri globular star cluster -- climb highest in our northern skies when the constellation Virgo stands on the meridian, or due south.
Omega Centauri or NGC 5139 is a well-known globular star cluster. Orbiting the Milky Way, it is the brightest and largest star cluster in the sky associated with our galaxy.
This stellar swarm is M80 (NGC 6093), one of the densest of the 147 known globular star clusters in the Milky Way galaxy.
Forbes and Bridges determined that these foreign-born globular star clusters actually make up about one quarter of our Milky Way globular star cluster system, ...
In the 1940s, elliptical galaxies were assigned by Walter Baade to his Population II, by which he meant specifically that the color-magnitude diagram of their stellar population should be essentially the same as that for globular star clusters of the ...
Scorpius is a large and sprawling constellation which lies near the Milky Way, and thus holds many bright open and globular star clusters: a welcome change after hunting down the faint and distant galaxies of the Virgo-Coma galaxy cluster.
A 1,679 bit message was transmitted from the 305-meter Arecibo radio observatory dug into the ground in Puerto Rico toward the globular star cluster M13, about 25,000 light-years away.
The planet is located in the globular star cluster M4, about 5,600 light years from Earth in the constellation Scorpius.
(a) A spherical aggregation of stars, globular star clusters, and thin gas clouds, centered on the nucleus of the galaxy and extending beyond the known extremities of the galactic disk. [F88] ...
(Added 01/17/05) A dense globular star cluster near the center of our Milky Way Galaxy holds a buzzing beehive of rapidly-spinning millisecond pulsars, ...
Tucana's brightest star is of only third magnitude, but the constellation is distinguished by two features: firstly, the globular star cluster 47 Tucanae, rated the second-best such object in the entire sky, ...
Omega Centauri A globular star cluster in the constellation of Centaurus. Globulars are made up of tens of thousands of stars and form a shell around our galaxy. Omega Centauri and 47 Tucanae are two of the finest examples of these objects.
Highlights include Omega Centauri, the brightest globular star cluster visible in Earth's sky, and Alpha Centauri, the closest star system to our own. Unfortunately, Alpha Centauri is visible only from the farthest southern points in the U.S.
Black hole found in ancient lair BBC - January 5, 2007
First black hole found in globular star cluster New Scientist - January 4, 2007 ...
The bright fuzzy image to the right of center is the great globular star cluster Omega Centauri. Zeta Cen is just down and to the left of it. Lupus is down toward the lower left corner, the bright star there Kakkab, Alpha Lupi.
The four stars of the central trapezoid within Hercules, epsilon Her, zeta Her, eta Her, and pi Her, form the asterism called Keystone. The globular star cluster M13 is located on the western part of the Keystone.
 See also: Cluster, Star Cluster, Star, R Star, Light
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