open cluster

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noun Astronomy.

a comparatively young, irregularly shaped group of stars, often numbering up to several hundred, and held together by mutual gravitation; usually found along the central plane of the Milky Way and other galaxies.

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Also called galactic cluster .

Compare globular cluster, stellar association.

Words nearby open cluster

open chain, open cheque, open circuit, open city, open classroom, open cluster, Open College, open communion, open-concept, open convention, open couplet

How to use open cluster in a sentence

When it became too crowded, they moved her into an open casket on the street.
New York’s Most Tragic Ghost Loves Minimalist Swedish Fashion|Nina Strochlic|January 8, 2015|DAILY BEAST
Now it can't open on my phone due to what appears to be software incompatibility.
My Week on Jewish Tinder|Emily Shire|January 5, 2015|DAILY BEAST
Some of them would open up deep splits in core Democratic constituencies.
Thank Congress, Not LBJ for Great Society|Julian Zelizer, Scott Porch|January 4, 2015|DAILY BEAST
To his credit, Huckabee is conscious of the fact that he will need a cluster of deep-pocketed patrons and bundlers.
Can Huckabee Convert the GOP’s Moneymen?|Lloyd Green|January 4, 2015|DAILY BEAST

And of course, Rod, being Rod, goes for it a hundred percent; his mouth drops open and he says, ‘What?’
The Story Behind Lee Marvin’s Liberty Valance Smile|Robert Ward|January 3, 2015|DAILY BEAST
Let them open their minds to us, let them put upon permanent record the significance of all their intrigues and manœuvres.
The Salvaging Of Civilisation|H. G. (Herbert George) Wells
The doors (Indian bungalows have hardly any windows, each door being half glass) were open front and back.
The Red Year|Louis Tracy
It was close upon twelve o'clock, and the "Rooms" had been open to the public for two hours.
Rosemary in Search of a Father|C. N. Williamson
Worst danger zone, the open sea, now traversed, but on land not yet out of the wood.
Gallipoli Diary, Volume I|Ian Hamilton
To think,” said the younger Englishwoman to her sister, “of this wee mite travelling about in an open motor!
The Joyous Adventures of Aristide Pujol|William J. Locke

Scientific definitions for open cluster

open cluster

A loose, irregular grouping of stars that originated from a single nebula in the arms of a spiral galaxy. Compared to globular clusters, open clusters generally contain younger and fewer (from a hundred to several thousand) stars and are confined to the disk of the galaxy. Because they are young, open clusters are sometimes still surrounded by the leftover gas and dust from which they formed. Visible from Earth with just a pair of binoculars and containing over 3,000 stars, the Pleiades is the best known open cluster. Also called galactic cluster Compare globular cluster.