Cluster
Related Category: Astronomy: General
in astronomy: see star cluster; galaxy.
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Clusters, Clusters Everywhere
With it's strange sounding Arabic name, Sadr is one of the brightest, easiest stars to find at this time of year. Shining at magnitude 2.3, it is about as bright as a typical approach of the planet Saturn.
Cluster Environment
The central regions of the Coma cluster. The bright cD galaxy is clearly visible.
Credit: NASA ...
Cluster watches formation of aurorae
KEITH COOPER
ASTRONOMY NOW
Posted: 12 April ...
Subcluster
A subcluster or subclump (or subgroup) is a term used in galactic astronomy to include an identifiable isolated grouping of galaxies within a cluster of galaxies, typically centered on a large dominant member.
STAR CLUSTERS
Open clusters are found in the disk of the Galaxy, and therefore lie largely in the plane of the Milky Way.
Clusters of Galaxies
The Perseus Galactic Cluster
A galaxy is a huge group of stars, dust, gas, and other celestial bodies bound together by gravitational forces.
Open clusters are also sometimes called galactic clusters because they lie relatively close to us, and they are within the disk of the galaxy. Open clusters can contain anywhere from a few dozen to a few hundred stars.
Definition: cluster of galaxies: A system of galaxies containing from a few to a few thousand member galaxies which are all gravitationally bound to each other.
Space Tragedies9 Planets in Nine DaysAstronomy 101
Related Articles ...
Note: Further articles about clusters can be requested on the list of unwritten cluster articles.
Pages in category "Clusters"
The following 33 pages are in this category, out of 33 total.
Cluster X-ray sources have been reviewed by Forman and Jones 1982 (ARA&A 20, 547) and Sarazin 1986 (Rev. Mod. Phys. 58, 1).
Cluster Ages and Zero-Age Main Sequence
Star clusters are particularly important because they allow astronomers to check models of stellar evolution and the ages of stars. Let us look firstly at open clusters to understand why this is so.
Open cluster
Wikipedia, the free encyclopedia - Cite This Source
An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud, and are still loosely gravitationally bound to each other.
Star Clusters
A grouping of the same types of astronomical objects. For example, stars in the Milky Way can group together into open clusters or globular clusters.
Open clusters - NGC objects 4755, 265, 290 & 6231
Why Open Clusters are Important ...
star cluster
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Arches Cluster
Arches Cluster, as seen by the Hubble Telescope
Arches Cluster (inset) at X-ray wavelengths, with radio filaments ...
Beehive cluster may be twins in disguise
M44, the Beehive Cluster. New observations suggest that this may be two separate clusters, which are colliding with one another.
Clusters are made up of two basic types of matter: luminous matter (like stars and hot gas) and dark matter. Dark matter does not shine on its own, and the only way we know it exists is because of its gravitational affect on luminous matter.
Star Cluster
Associations have 10-100 stars (e.g., OB, T Tauri). have 105-106 , 75 in diameter. Open clusters have 100-1000 , 10-100 in diameter.
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Abell clusters are large clusters of galaxies, catalogued by George O. Abell for his PhD dissertation in 1958.
Globular Cluster:
This stellar swarm is M80 (NGC 6093), one of the densest of the 147 known globular star clusters in the Milky Way galaxy.
Globular Cluster
A gravitationally bound collection of 10,000-100,000 stars. They usually contain old stars and are distributed spherically about the center of .
Globular clusters are found both in spiral galaxies and elliptical galaxies. The Milky Way, for example, has over one hundred globular clusters throughout it's halo.
A Matter of Scale ...
The Virgo Cluster
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Virgo Galaxy Cluster - Finder Chart
Map created in Guide 7.0 - click on the object name to access its image or click constellation name to see its map ...
Whether you see the cluster with the unaided eye or not, try your luck with binoculars. Chances are the misty patch will turn into a glittery array of stars! ...
1918 - Harlow Shapley demonstrates that globular clusters are arranged in an spheroid or halo whose center is not the Earth, decides, correctly, that its center is the center of the galaxy, ...
Beyond the New General Catalog there are dozens of other catalogues of deep sky objects - the Dolidze Dzimselejsvili (DoDz) open clusters catalogue is one of them.
CLUSTER LIFETIMES
Until recently, the existence of star clusters within emission nebulae was largely conjecture"the stars cannot be seen optically because they are obscured by dust.
Clusters of Galaxies
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cluster of galaxies
A system of galaxies containing from a few to a few thousand member galaxies which are all gravitationally bound to each other.
Cluster Method
The method of determining the masses of galaxies in a cluster.
CNO Cycle ...
Cluster of Galaxies - A group of galaxies held together by their mutual gravitational attraction
Cluster of Stars - A group of stars held together by their mutual gravitational attraction ...
Cluster munitions or cluster bombs are air-dropped or ground-launched munitions that eject smaller submunitions: a cluster of bomblets....
Cluster of Galaxies
An aggregate of galaxies. Bautz and Morgan divide them into three morphological types: type I contains a supergiant cD galaxy; type III contains no members significantly brighter than the general bright population.
star cluster A group of stars physically close together in space. star grain = star perforated grain. Stark effect The broadening or splitting of a spectral line observed when a luminous gas is acted upon by a strong electric field.
open cluster
a system containing a few dozen to a few thousand stars that formed from the same stellar nursery
opposition ...
Open Cluster: An open cluster consists of about a few hundred stars, the stars are mainly younger stars. The typical diameter of an open cluster is less than 100 light years.
OPEN CLUSTER - Cluster of stars usually containing several 100 members packed into a region usually less than 20 light years in size. They are normally found near regions of star formation in the spiral arms of galaxies.
Star Cluster: A group of stars which are held together by their mutual gravitational attraction.
open cluster
A loose collection of hundreds of stars that are gravitationally bound to each other. Also known as a galactic cluster.
opposition
When a superior planet is directly opposite from the Sun in our sky, and is closest to the Earth.
Rich Clusters
Clusters with a particularly large number of galaxies. [LB90]
Richardson-Lucy Method
An image reconstruction algorithm. [McL97]
Riemannian Geometry ...
Open Cluster
a collection of young stars that formed together. They may or may not be still bound by gravity. Some of the youngest open clusters are still embedded in the gas and dust from which they formed.
Open Cluster. A loose association of stars with no clearly defined shape. Often referred to as 'Galactic Clusters' since they are all found close to the galactic plane (of our galaxy).
Galaxy Clusters
Most galaxies are found in groups or clusters which contain a few to thousands of galaxies bound together by their mutual gravity.
Moving Cluster Method
In addition to parallax distances the careful measurement of stellar positions allows one to measure the proper motion of stars.
Galaxy Clusters
Once people realized galaxies are objects outside of our own galaxy, they noticed that galaxies are not randomly scattered across the Universe. They tend to be found in groups or clusters - what an original name! ...
clusters of galaxies Galaxies can swarm together to form groups and clusters of galaxies held together by their mutual galaxy. X-ray observations show that these enormous systems of galaxies are filled with colossal clouds of hot gas.
Cluster: A group of stars that are close together.
COBE: The COsmic Background Explorer. COBE was launched into Earth orbit in 1989 to image the cosmic background radiation.
Clusters
A group or stars, or galaxies which are held together by their common gravity.
Color index ...
cluster (astronomical) - (n.)
Group of stars numbering from a few to hundreds of thousands of stars. Galactic clusters, sometimes called open clusters, contain up to a few hundred members and occur rather close to the plane of the Galaxy.
CLUSTER
A cluster is a group of stars or . Our own galactic cluster, the , is about 5 million across and contains about 30 galaxies (the largest of which are the , Triangulum, and our ).
CLUSTER
A cluster is a group of stars or galaxies. Our own galactic cluster, the Local Group, is about 5 million light-years across and contains about 30 galaxies (the largest of which are the Andromeda galaxy, Triangulum, and our Milky Way).
A cluster of 100-1,000 stars with an open, transparent appearance. The stars are not tightly grouped. Usually relatively young and located in then disk of the galaxy.
Site Map
Glossary ...
A cluster of stars within a cloud of gas and dust.
Docking
When one spacecraft attatches itself to something else.
The cluster is dominated by hot blue stars, which have formed within the last 100 million years.
The cluster is found eight degrees SW of alpha Serpentis. M16 (NGC 6611), "The Eagle Nebula", is a remarkable open star cluster surrounded by a huge nebula, very luminous with dark streaks of dust: a nursery of newly forming stars.
The cluster in low powered 7x50 binoculars is one of the finest sights in the heavens. In larger telescopes the Pleiades is disappointing since only part can be observed.
Open clusters: NGC 2516, NGC 3114, NGC 3293, NGC 3532, IC 2602, I 2714, Mel 105
Globular cluster NGC 2808
Planetary nebula NGC 2867
Diffuse nebula NGC 3372 (Eta Carinae Nebula)
Variable stars eta Car ...
 See also: Star, Light, Clusters, Earth, Sky
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