Definitions

1. Globular clusters, the central supermassive black hole, and a galactic bulge of metal-poor Population II stars form.
2. Globular clusters are gravitationally bound systems of hundreds of thousands of stars that orbit in the halos of galaxies.
3. Globular clusters are among the oldest objects in the Galaxy, forming when the Milky Way was young.
4. Globular clusters are generally composed of hundreds of thousands of low-metal, old stars.
5. Globular clusters are composed of older stars, and are usually found around the central regions of a galaxy.

Galactic Centre

1. Most globular clusters can be found near the galactic centre, but this one lies in the opposite direction.

Young Globular Clusters

1. There are few, if any, young globular clusters in our Milky Way Galaxy because conditions are not ripe for more to form.
2. Other astronomers, however, argued that there was no such evidence for young globular clusters.

Ngc Globular Clusters

1. No doubt some of these 36 (23+13) NGC globular clusters are members of the LMC. This still leaves a difference of some 19 globular clusters.
2. In any case, the point is that even though many, if not most, NGC globular clusters are denizens of our galaxy, not all are.

Nearest Globular Clusters

1. M4 is one of the largest and nearest globular clusters.

Seven Globular Clusters

1. There are 15 in all, including seven globular clusters, four open star clusters, three nebulae, and an interesting patch of the Milky Way.

Hundred Globular Clusters

1. The Milky Way, for example, has over one hundred globular clusters throughout it's halo.

Globular Clusters Belonging

1. However, a fair number of those near NGC 4945 are globular clusters belonging to this galaxy.

Large Population

1. It has a substantially large population of globular clusters (about 600) than does the Milky Way.
2. It sports a pronounced dust lane as well as a large population of globular clusters.

Near-Collisions

1. Globular clusters have a very high star density, and therefore close interactions and near-collisions of stars occur relatively often.

Own Milky Way

1. M104 is surrounded by globular clusters in the hundreds � a much richer population than our own Milky Way or most other observed galactic bulges.

Cepheids

1. Noella D'Cruz's Home Page - research work which is related to globular clusters, Cepheids and clusters of galaxies is also linked.

Dwarf Galaxies

1. Dwarf galaxies and Globular clusters also were early members of the hierarchy of galactic types.

Large Radii

1. Almost all globular clusters have a half-light radius of less than 10 pc, although there are well-established globular clusters with very large radii (i.e.

Six Globular Clusters

1. The galaxy is a satellite of the Milky Way and contains six globular clusters; the largest, NGC 1049, was discovered before the galaxy itself.
2. There are six globular clusters, four open clusters, and two diffuse nebula.

Globular Clusters Orbiting

1. M110 is remarkable for having a system of eight globular clusters orbiting it like a halo.

M15

1. The Milky Way still appears complex, and globular clusters such as M4, M5, M15, and M22 are all distinct naked-eye objects.
2. M15 (NGC 7078) is one of the finest globular clusters in the heavens, very bright and compact, at 35,000 to 40,000 light years away.

M13

1. Bright globular clusters like M13 and M22 can be resolved into stars at the edges.
2. M13 Globular cluster in Hercules M13 (NGC 6205) Discovered by Edmond Halley in 1714, M13 is one of the finest globular clusters in the Northern Hemisphere.

Omega Centauri

1. For astronomers, Omega Centauri has been an outcast amongst globular clusters for a long time.

Nearer Globular Clusters

1. M9 is one of the nearer globular clusters to the nucleus of our Galaxy.

Farther

1. Stars can be much closer to each other in the centres of galaxies and in globular clusters, or much farther apart in galactic halos.

Galaxy Clusters

1. BARKHOUSE, Wayne (University of Toronto) Research interests: Galaxy clusters, luminosity functions, dwarf galaxies, and globular clusters.

Collections

1. With collections of stars (like globular clusters and galaxies), it is theoretically possible to calculate the effect of Newton’s laws on each object.

Contrast

1. In contrast, globular clusters are very tightly bound by gravity.
2. Open clusters line the Galactic plane, in contrast with globular clusters, which are members of the Galaxy's halo or thick disk.

Images

1. We use the Planetary Camera to obtain images of stars in globular clusters.

Formation

1. How these clusters are formed is not yet known, but their formation might well be related to that of globular clusters.

Process

1. However about 20% of the globular clusters have undergone a process termed "core collapse".
2. In the process we have been able to answer some questions about globular clusters and galaxies.

Thought

1. It is thought to be one of the largest and oldest globular clusters.

Similar

1. Most of these are globular clusters, similar to those found in our own Milky Way, but Messier 104 has a much larger number of them.
2. M69, similar as its neighbor M70, is one of the smaller and fainter globular clusters in Messier's catalog.

Million

1. Globular clusters have between 50,000 and a million stars; open clusters have less than 50,000 stars.

Old

1. This indicates that And III does contain an "old" population of age comparable to that of the Galactic globular clusters.
2. Presumably, the universe itself is at least as old as the oldest globular clusters that reside in it.

Sun

1. Globular clusters normally consist of Population II stars, which have a low metallic content compared to Population I stars such as the Sun.

Times

1. What distinguishes them from the globular clusters is that they are much larger - several hundred light years across - and hundreds of times less dense.

Diameter

1. At 175 light-years in diameter, it is one of the larger globular clusters known.
2. M4 is visually one of the largest globular clusters, with an apparent diameter of around 20 arcmin and a central brightness around 10-12 arcmin in diameter.

Spherical

1. Globular clusters are huge, spherical, gravitationally bound collections of stars.

Disk

1. The disk is surrounded by a spheroid halo of old stars and globular clusters.

Galactic Clusters

1. Open clusters, also called galactic clusters, contain fewer and younger stars than globular clusters.

Central Regions

1. The central regions of high density globular clusters are crowded neighbourhoods where interactions between stars are nearly inevitable.

Regions

1. Much older than these are the Population II stars, which dominate the regions around the core, and are also commonly found in Globular Clusters.
2. This regions contains many nebulae, open clusters and globular clusters.
3. M107 apparently contains some dark obscured regions, which is unusual for globular clusters.

Catalog

1. These include four globular clusters, the largest and the smallest planetary nebulas in the catalog, and a small oddity.
2. M79 - One of the smallest and dimmest globular clusters in the catalog.

Nebula

1. Variable stars, double stars, galaxies, quasars, nebula, globular clusters, open clusters, moon, planets, sun.
2. It is also useful for locating planets, stars, constellations, globular clusters, nebula and galaxies at any particular time.

Massive

1. Recent evidence indicates that Omega Centauri is by far the most massive of the about 150 known globular clusters in the Milky Way.
2. Of the about 150 known globular clusters in our Milky Way Galaxy, NGC 2808 is one of the most massive, containing more than 1 million stars.

Center

1. A simple understanding of the law of gravity suggested that the globular clusters were orbiting around the center of mass of the Milky Way.

Different

1. Open clusters, (OC) are very different from globular clusters.

Makeup

1. The makeup of its stars are different from either open or globular clusters.
2. All galaxies and globular clusters include a wide range of stellar types in their makeup.

Millions

1. Globular clusters occur in all types of galaxies and contain anywhere from 100,000 to millions of stars.

Estimated

1. At an estimated 13.2 billion years old, it is one of the oldest known globular clusters.
2. The stars in M15 and other globular clusters are estimated to be about 12 billion years old.

Categories

1. Clusters
2. Astronomy > Universe > Galaxies > Milky Way
3. Science > Astronomy > Universe > Galaxies
4. Information > Science > Astronomy > Nebulae
5. M31

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