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Star clusters are large groups of stars held together by self-gravitation. Two main types of star clusters can be distinguished. Globular clusters are tight groups of ten thousand to millions of old stars which are gravitationally bound. Open clusters are more loosely clustered groups of stars, generally containing fewer than a few hundred ...
An open cluster is a type of star cluster made of tens to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way galaxy, and many more are thought to exist. [1]
A globular cluster is a spheroidal conglomeration of stars that is bound together by gravity, with a higher concentration of stars towards its center. It can contain anywhere from tens of thousands to many millions of member stars, [2] all orbiting in a stable, compact formation. Globular clusters are similar in form to dwarf spheroidal ...
A star system or stellar system is a small number of stars that orbit each other, [1] bound by gravitational attraction.A large group of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.
Taurus. See also: Open cluster, List of open clusters. The Pleiades (/ ˈpliː.ədiːz, ˈpleɪ -, ˈplaɪ -/), [8][9] also known as the Seven Sisters and Messier 45, is an asterism of an open star cluster containing middle-aged, hot B-type stars in the northwest of the constellation Taurus.
Named for its size, El Gordo ("the fat one") is the biggest cluster found in the distant universe (at its distance and beyond), at the time of discovery in 2011, with a mass of 3 quadrillion suns. The second most massive galaxy cluster next to El Gordo is RCS2 J2327, a galaxy cluster with the mass of 2 quadrillion suns.
Star formation. Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or " star -forming regions", collapse and form stars. [1] As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC ...
Messier 13 is the home of the antagonistic aliens in the 1977 space opera The War in Space, who hail from the third planet of a system orbiting a star called Yomi. Deliberately engineering a star in Messier 13 to go nova was part of the Cybermen 's complicated plot in the 1968 Doctor Who story The Wheel in Space.
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