irregular cluster

irregular cluster

See regular cluster.

irregular cluster

[i′reg·yə·lər ′kləs·tər]
(astronomy)
A type of galaxy cluster that has an overall amorphous appearance, usually showing little overall symmetry or central concentration and often composed of several distinct clumps of galaxies.
References in classic literature ?
The village street--if street that could be called which was an irregular cluster of poor cottages of many heights and ages, some with their fronts, some with their backs, and some with gable ends towards the road, with here and there a signpost, or a shed encroaching on the path--was close at hand.
Far off, a little thing in the sunshine, and rushing down as if some one was bending it hollow, was the beach and the irregular cluster of houses that constitutes Dymchurch.
It is a poor, irregular cluster with some 20 certain members: three spirals (the Galaxy, M31, and M33); four irregulars (LMC, SMC, IC 1613, and NGC 6822); and about 13 intermediate or dwarf ellipticals (NGC 147; NGC 185; NGC 205; M32; the Sculptor, Fornax, Leo I and II, UMi, and Draco systems; and the three companions to M31).
For example, much housing consisted of an irregular cluster of stone and mud-brick one storey structures.
In many other cases, the differences between dense and nondense areas are less clear cut, resulting in wildly irregular cluster shapes, clusters that touch or nearly touch, and clusters with holes or exclaves.
Much of the housing in other parts of Turkey consisted of an irregular cluster of stone and mud-brick one-storey structures, sometimes lacking proper facilities and utilities.