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protocluster
protocluster n. 
/ˈproʊdəˌkləstər/ Astronomy a mass of gas and dust from which a cluster of galaxies is thought to develop.
Brit. /ˈprəʊtə(ʊ)ˌklʌstə/
, /ˈprəʊtə(ʊ)ˌklʌstə/U.S. /ˈproʊdoʊˌkləstər/
, /ˈproʊdoʊˌkləstər//ˈproʊdəˌkləstər/ΘΚΠ
the world > the universe > constellation > galaxy > [noun] > protogalaxy
protocluster1953
protogalaxy1953
protocloud1970
1953 Sci. Monthly Dec. 285/2 One of the intermediate steps may..be the formation of proto-clusters of galaxies.
1976 Nature 11 Nov. 114/2 Four stages might usefully be distinguished: (1) the creation of a massive protocluster cloud; (2) the separation of individual protostars from such a protocluster cloud; [etc.].
1990 J. Gribbin & M. Rees Cosmic Coincidences (1991) ii. 58 Patches of the sky that are each a few minutes of arc across (the angular size, viewed from Earth, of a protocluster of galaxies at redshift z = 1,000) all have the same temperature to within 1 part of 20,000.
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