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Star Cluster

The term refers to groups of stars that are either tightly clustered together (Globular) or loosely (Open). The most well known and famous of clusters must be the Seven Sisters or Pleiades in the constellation of Taurus.

Globular Cluster

Globular clusters tend to be old clusters of stars that can range in numbers from 10,000 to anything up to several million. The shape of Globular Clusters are roughly spherical in nature hence where its name comes from (Globe). As mentioned, they tend to be old stars, born not that long after the the beginning of the universe. Although the vast majority of Globular Clusters contain white and yellow stars, they have been a few blue stars in amongst clusters.

Open Cluster

Stars in an Open Cluster tend to be younger stars compared to Globular Clusters and they don't tend to be as tightly compact. Open Cluster stars all tend to be made of the same material and can be of different ages. At the birth of the Open Cluster, all the stars will be of the same age but they can die at different rates. All the stars aren't the same size but be varying sizes. They don't all stay clustered together as they can different away from one another. Of the two types of cluster, these are the more common of the two types with as many as 1000 having been discovered. An Open Cluster whilst it can loose stars as they move away, it can replace the lost stars with new stars from the same material. This is something that a Globular Cluster is unable to do, that is replace a star which is lost. When a Globular Star is lost, its lost and irreplaceable thereafter.

Age of a Cluster

You can determine the age of the star cluster by looking at the colour of the stars that exist in the cluster. All the stars should be roughly the same age. If the cluster is relatively blue then the stars are hot and young and will only last millions of years. If the cluster is yellow then the cluster will last billions of years. If the cluster is red then the cluster is old and can last trillions of years.

If the cluster is predominantly red but there are some blue stars in amongst the stars then its a good sign that there are Vampire Stars in amongst the cluster. In short, vampire stars suck material and fuel from a close star and as they feed and grow, the Vampire Star can appear blue and younger than other stars in the cluster. Ref: Science Channel

M2Globular ClusterAquarius
M72Globular ClusterAquarius
Westerlund 1Star ClusterAra
M36Open ClusterAuriga
M37Open ClusterAuriga
M38Open ClusterAuriga
Praesepe, the Beehive ClusterOpen ClusterCancer
M67Open ClusterCancer
M3Globular ClusterCanes Venatici
M41Open ClusterCanis Major
M30Globular ClusterCapricornus
Westerlund 2Star ClusterCarina
M103Open ClusterCassiopeia
M52Open ClusterCassiopeia
M53Globular ClusterComa Berenices
M39Open ClusterCygnus
M29Open ClusterCygnus
Tarantula NebulaGlobular ClusterDorado
M35Open ClusterGemini
The Great Hercules Globular ClusterGlobular ClusterHercules
M92Globular ClusterHercules
M68Globular ClusterHydra
M48Globular ClusterHydra
M79Globular ClusterLepus
M56Globular ClusterLyra
M50Open ClusterMonoceros
M12Globular ClusterOphiuchus
M14Globular ClusterOphiuchus
M19Globular ClusterOphiuchus
M9Globular ClusterOphiuchus
M10Globular ClusterOphiuchus
M62Globular ClusterOphiuchus
M107Globular ClusterOphiuchus
M15Globular ClusterPegasus
M34Open ClusterPerseus
M46Open ClusterPuppis
M47Open ClusterPuppis
M93Open ClusterPuppis
M71Globular ClusterSagitta
M75Globular ClusterSagittarius
M69Globular ClusterSagittarius
M70Globular ClusterSagittarius
M54Globular ClusterSagittarius
M55Globular ClusterSagittarius
M28Globular ClusterSagittarius
M18Open ClusterSagittarius
M21Open ClusterSagittarius
M22Globular ClusterSagittarius
M23Open ClusterSagittarius
M24Milky Way Patch Star Cloud with Open ClusterSagittarius
M25Open ClusterSagittarius
Butterfly ClusterOpen ClusterScorpius
Ptolemys ClusterOpen ClusterScorpius
M4Globular ClusterScorpius
M80Globular ClusterScorpius
Wild Duck ClusterOpen ClusterScutum
M26Open ClusterScutum
M5Globular ClusterSerpens
Pleiades, the Seven SistersOpen ClusterTaurus
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