Star clusters or star clouds are groups of stars. Two types of star clusters can be distinguished: globular clusters are tight groups of hundreds of thousands of very old stars which are gravitationally bound, while open clusters, more loosely clustered groups of stars, generally contain fewer than a few hundred members, and are often very young. Open clusters become disrupted over time by the gravitational influence of giant molecular clouds as they move through the galaxy, but cluster members will continue to move in broadly the same direction through space even though they are no longer gravitationally bound; they are then known as a stellar association, sometimes also referred to as a moving group.
Star clusters visible to the naked eye include Pleiades, Hyades and the Beehive Cluster.
Other articles related to "star cluster, clusters, stars, cluster, star":
... Stellar clusters are important in many areas of astronomy ... Because the stars were all born at roughly the same time, the different properties of all the stars in a cluster are a function only of mass, and so stellar evolution ... Clusters are also a crucial step in determining the distance scale of the universe ...
... The Coma Star Cluster in Coma Berenices, designated Melotte 111 after its entry in the catalogue of deep sky objects by P ... Melotte, is a small but nearby star cluster in our galaxy, containing about 40 brighter stars (magnitude 5 to 10) with a common proper motion ... diagram fitting have been used to establish a distance to the cluster's center of ~86 pc ...
... Y-DNA network analysis of Y-STR haplotypes showing a non-star cluster indicates Y-STR variability due to multiple founding individuals ... Analysis yielding a star cluster can be regarded as representing a population descended from a single ancestor ... of Genghis Khan or one of his ancestors represents a famous star cluster that can be dated back to the time of Genghis Khan ...
... of a few marginally habitable planets or moons within the double-binary Cyrannus star cluster, which are the site of some human habitation ... is so low - 1.4 million, compared to the total 28.5 billion population of the star system as a whole - that they have little social or political significance, and are truly more "outposts ... into some more detail, stating that minor colonies were located on four planets or moons in the star cluster Minos - a moon of Tauron, located in Helios Alpha, and the largest moon in the entire star cluster ...
... The Five Star Stories takes its name from the Joker Star Cluster where the stories take place ... The star cluster is made up of four stars Eastern, Western, Southern and Northern ... The "fifth star" is a large comet named Stant that passes through that sector of space every 1,500 years pulling with it its own collection of orbiting planets ...
Famous quotes containing the words cluster and/or star:
“the green hells of the sea
Where fallen skies and evil hues and eyeless creatures be;
On them the sea-valves cluster and the grey sea-forests curl,
Splashed with a splended sickness, the sickness of the pearl;”
—Gilbert Keith Chesterton (18741936)
“Our star was brighter perhaps when it had water in it.
Now there is no question even of that, but only
Of holding on to the hard earth so as not to get thrown off,
With an occasional dream, a vision ...”
—John Ashbery (b. 1927)