Stellar Clusters
Stellar cluster or cluster of stars is a group of stars bounded by their mutual gravity. When compared with the multiple star systems, they consist of many more stars, from tens to millions.
The open stellar cluster Hyades in Taurus extends over such a large part of the sky, 20 degrees, that the proper motions as derived from astrometry appear to converge with some precision to a perspective point north of Orion.
(a) Of a stellar cluster or galaxy, the "orbiting" of stars nearer the center faster than those at the edge. Of a single body (such as the Sun or a gaseous planet), the axial rotation of equatorial latitudes faster than polar latitudes.
A second type of stellar cluster, of which a representative is shown in Figure 17.24(a), is called a globular cluster. Globular clusters are much more tightly knit than the loose groups of stars that make up open clusters.
Suppose we observe a stellar cluster. All the stars in that cluster were formed, more or less, at the same time out of the same giant molecular cloud. So all the stars started out on the ZAMS simultaneously.
Dust which condenses from a supernova explosion is usually too cold to emit in the infrared, but the presence of the stellar cluster has enabled astronomers to make these rare observations.
Without it, stars, stellar clusters, galaxies, and groups and clusters of galaxies would all expand and dissipate.
A class Y cluster is a type of stellar cluster.
The USS Voyager investigated a class-Y cluster in 2375. (VOY: "11:59")
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Herein you will find information on different types of nebulae; stellar birth, life, and death; different types of dead stars, including the enigmatic black hole; stellar clusters; binary stars; and variable stars.
They are are particularly useful to astronomers as they provide a way to study and model stellar evolution and ages. The two basic categories of stellar clusters are open clusters, also known as galactic clusters, and globular clusters.
in which velocities are small compared to c and gravitational potentials are weak enough that they cannot cause larger velocities. This is why we can discuss with newtonian theory the structure of the earth and planets, stars and stellar clusters, ...
 See also: Cluster, Star, Second, Gravitation, Astronomy
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